Содержимое бутстрапа 4 и боковой панели навигации.

Я разработал приложение для своего университета, которое использовалось для Bootstrap-4 im make 4 part заголовок, content-top-fat, контент-бот-жир, основной контент и нижний колонтитул im попытайтесь fixed header, content-top-fat, content-bot-fat и footer Мне нужно прокрутить только часть main-content, после того, как я добавил меню навигации боковой панели, это не выглядит хорошо, всегда overlap может понять мой код и изображение, пожалуйста, помогите мне исправить эту проблему, как исправлять эту часть и прокручивать только main-content часть, мой main-content прокрутка катны части,

спасибо

function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
  }

  function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
  }
body.mainbody {
  overflow: hidden;

  font: 13px/1.7em 'sans-serif';
  font-family: sans-serif;
}

html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

.bg-inverse {
  background-color: grey !important;
}

.header {
  width: 100%;
  height: 5%;

  background: red;
  position: fixed;
  top: 0;
}

.footer {
  width: 100%;
  height: 60px;
  background: grey;
  position: fixed;
  bottom: 0;

}

.main-content{
  height: 85%;
  margin-top:5%;
z-index: -1; overflow-y: scroll;
}

#content-top {
  width: 100%;
  top: 5%;
  height: 5%;
  padding: 1.5%;z-index: -1;
background-color: white;
  position: fixed;
}
#content-top-fat {
  width: 100%;
  top: 5%;
  background-color: white;
  height: 5%;
  padding: 1.5%;
  z-index: 1;
  position: fixed;
}
#content-bot-fat {
  width: 100%;
  top: 10%;  z-index: -1;
  height: 5%;
  padding: 1.5%;
  background:white;
  position: fixed;
}
.p-2 {
  padding: 0.4em 0.5rem !important;
}
#contents {
  /*position: fixed;*/

  overflow-x: hidden;
margin-top: 6.5rem;
padding: 2%;
}


.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 5;
  top: 0;
  right: 0;
  background-color: #eee;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidenav a:hover, .offcanvas a:focus{
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}
<link href="#" onclick="location.href='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css'; return false;" rel="stylesheet"/>
<body class="mainbody">
<div class="header">
<div class="d-flex justify-content-end">
  <div class="mr-auto p-2">Dashboard</div>
  <div class="p-2"></div>
  <div class="p-2"><span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; </span></div>
</div>

<div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Clients</a>
  <a href="#">Contact</a>
</div>
</div>
<!--/header-->
<div id="content-top-fat">
  <div class="add-text-fat">
    <div class="d-inline-flex ">+</div>
    <div class="d-inline-flex ">Add New Rate Plan</div>

  </div>


</div>
<div id="content-bot-fat">


  <div class="d-flex justify-content-center"><p class="rateplan-date">Thursday, April, 20, 2017
  </p></div>
</div>
<!--content-->
<div class="main-content">
  <div id="contents">
 

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

Components
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With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.




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Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with p
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

Components
Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.
  </div>
</div>

<div class="footer"></div>
</body>

ОТВЕТЫ

Ответ 1

измените ваш .sidenav{position:fixed; top:0;} на .sidenav{position:absolute; top:5%;}

function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
  }

  function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
  }
body.mainbody {
  overflow: hidden;

  font: 13px/1.7em 'sans-serif';
  font-family: sans-serif;
}

html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

.bg-inverse {
  background-color: grey !important;
}

.header {
  width: 100%;
  height: 5%;

  background: red;
  position: fixed;
  top: 0;
}

.footer {
  width: 100%;
  height: 60px;
  background: grey;
  position: fixed;
  bottom: 0;

}

.main-content{
  height: 85%;
  margin-top:11%;
z-index: 0; overflow-y: scroll;
}

#content-top {
  width: 100%;
  top: 5%;
  height: 5%;
  padding: 1.5%;z-index: -1;
background-color: white;
  position: fixed;
}
#content-top-fat {
  width: 100%;
  top: 5%;
  background-color: white;
  height: 5%;
  padding: 1.5%;
  z-index: 1;
  position: fixed;
}
#content-bot-fat {
  width: 100%;
  top: 10%;  z-index: -1;
  height: 5%;
  padding: 1.5%;
  background:white;
  position: fixed;
}
.p-2 {
  padding: 0.4em 0.5rem !important;
}
#contents {
  /*position: fixed;*/

  overflow-x: hidden;
margin-top: 5.0rem;
padding: 2%;
}


.sidenav {
  height: 100%;
  width: 0;
  position: absolute;
  z-index: 5;
  top: 5%;
  right: 0;
  background-color: #eee;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidenav a:hover, .offcanvas a:focus{
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>
<body class="mainbody">
<div class="header">
<div class="d-flex justify-content-end">
  <div class="mr-auto p-2">Dashboard</div>
  <div class="p-2"></div>
  <div class="p-2"><span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; </span></div>
</div>


</div>
<div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Clients</a>
  <a href="#">Contact</a>
</div>
<!--/header-->
<div id="content-top-fat">
  <div class="add-text-fat">
    <div class="d-inline-flex ">+</div>
    <div class="d-inline-flex ">Add New Rate Plan</div>

  </div>


</div>
<div id="content-bot-fat">


  <div class="d-flex justify-content-center"><p class="rateplan-date">Thursday, April, 20, 2017
  </p></div>
</div>
<!--content-->
<div class="main-content">
  <div id="contents">
 

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.




Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with p
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

Components
Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.
  </div>
</div>

<div class="footer"></div>
</body>

Ответ 2

Я нашел проблему в вашем коде, и я ее исправил. Надеюсь, это поможет вам:)

function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
  }

  function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
  }
body.mainbody {
  overflow: hidden;

  font: 13px/1.7em 'sans-serif';
  font-family: sans-serif;
}

html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

.bg-inverse {
  background-color: grey !important;
}

.header {
  width: 100%;
  height: 5%;

  background: red;
  position: fixed;
  top: 0;
}

.footer {
  width: 100%;
  height: 60px;
  background: grey;
  position: fixed;
  bottom: 0;

}

.main-content{
  height: 85%;
  margin-top:11%;
z-index: 0; overflow-y: scroll;
}

#content-top {
  width: 100%;
  top: 5%;
  height: 5%;
  padding: 1.5%;z-index: -1;
background-color: white;
  position: fixed;
}
#content-top-fat {
  width: 100%;
  top: 5%;
  background-color: white;
  height: 5%;
  padding: 1.5%;
  z-index: 1;
  position: fixed;
}
#content-bot-fat {
  width: 100%;
  top: 10%;  z-index: -1;
  height: 5%;
  padding: 1.5%;
  background:white;
  position: fixed;
}
.p-2 {
  padding: 0.4em 0.5rem !important;
}
#contents {
  /*position: fixed;*/

  overflow-x: hidden;
margin-top: 5.0rem;
padding: 2%;
}


.sidenav {
  height: 100%;
  width: 0;
  position: absolute;
  z-index: 5;
  top: 5%;
  right: 0;
  background-color: #eee;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidenav a:hover, .offcanvas a:focus{
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>
<body class="mainbody">
<div class="header">
<div class="d-flex justify-content-end">
  <div class="mr-auto p-2">Dashboard</div>
  <div class="p-2"></div>
  <div class="p-2"><span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; </span></div>
</div>


</div>
<div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Clients</a>
  <a href="#">Contact</a>
</div>
<!--/header-->
<div id="content-top-fat">
  <div class="add-text-fat">
    <div class="d-inline-flex ">+</div>
    <div class="d-inline-flex ">Add New Rate Plan</div>

  </div>


</div>
<div id="content-bot-fat">


  <div class="d-flex justify-content-center"><p class="rateplan-date">Thursday, April, 20, 2017
  </p></div>
</div>
<!--content-->
<div class="main-content">
  <div id="contents">
 

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.




Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with p
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

Components
Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.
  </div>
</div>

<div class="footer"></div>
</body>

Ответ 3

Похоже, это проблема z-index, которая может быть решена путем перемещения z-index: 5 от .sidenav до .header

function openNav() {
    document.getElementById("mySidenav").style.width = "250px";
  }

  function closeNav() {
    document.getElementById("mySidenav").style.width = "0";
  }
body.mainbody {
  overflow: hidden;
  font: 13px/1.7em 'sans-serif';
  font-family: sans-serif;
}

html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

.bg-inverse {
  background-color: grey !important;
}

.header {
  width: 100%;
  height: 5%;
  z-index: 5;
  background: red;
  position: fixed;
  top: 0;
}

.footer {
  width: 100%;
  height: 60px;
  background: grey;
  position: fixed;
  bottom: 0;

}

.main-content{
  height: 85%;
  margin-top:5%;
z-index: -1; overflow-y: scroll;
}

#content-top {
  width: 100%;
  top: 5%;
  height: 5%;
  padding: 1.5%;z-index: -1;
background-color: white;
  position: fixed;
}
#content-top-fat {
  width: 100%;
  top: 5%;
  background-color: white;
  height: 5%;
  padding: 1.5%;
  z-index: 1;
  position: fixed;
}
#content-bot-fat {
  width: 100%;
  top: 10%;  z-index: -1;
  height: 5%;
  padding: 1.5%;
  background:white;
  position: fixed;
}
.p-2 {
  padding: 0.4em 0.5rem !important;
}
#contents {
  /*position: fixed;*/

  overflow-x: hidden;
margin-top: 6.5rem;
padding: 2%;
}


.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  top: 0;
  right: 0;
  background-color: #eee;
  overflow-x: hidden;
  transition: 0.5s;
  padding-top: 60px;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
}

.sidenav a:hover, .offcanvas a:focus{
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

@media screen and (max-height: 450px) {
  .sidenav {padding-top: 15px;}
  .sidenav a {font-size: 18px;}
}
<link href="#" onclick="location.href='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css'; return false;" rel="stylesheet"/>
<body class="mainbody">
<div class="header">
<div class="d-flex justify-content-end">
  <div class="mr-auto p-2">Dashboard</div>
  <div class="p-2"></div>
  <div class="p-2"><span style="font-size:30px;cursor:pointer" onclick="openNav()">&#9776; </span></div>
</div>

<div id="mySidenav" class="sidenav">
  <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">&times;</a>
  <a href="#">About</a>
  <a href="#">Services</a>
  <a href="#">Clients</a>
  <a href="#">Contact</a>
</div>
</div>
<!--/header-->
<div id="content-top-fat">
  <div class="add-text-fat">
    <div class="d-inline-flex ">+</div>
    <div class="d-inline-flex ">Add New Rate Plan</div>

  </div>


</div>
<div id="content-bot-fat">


  <div class="d-flex justify-content-center"><p class="rateplan-date">Thursday, April, 20, 2017
  </p></div>
</div>
<!--content-->
<div class="main-content">
  <div id="contents">
 

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.




Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with p
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.Preprocessor
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.
Bootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

ComponentsBootstrap ships with vanilla CSS, but its source code utilizes Sass, a popular CSS preprocessor. Quickly get started with precompiled CSS or build on the source.

Responsive across devices
One framework, every device.
Bootstrap easily and efficiently scales your websites and applications with a single code base, from phones to tablets to desktops with CSS media queries.

Components
Components
Full of features
With Bootstrap, you get extensive and beautiful documentation for common HTML elements, dozens of custom HTML and CSS components, and awesome jQuery plugins.
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