Bootstrap, используя make, как в раскрывающемся меню материала google

Я работаю над этой формой, используя `[email protected] '. В этом я хочу создать раскрывающееся меню, как показано на следующем изображении, так же, как в материальном дизайне, но я хочу сделать это с помощью bootstrap. Я пытаюсь использовать этот код, но он не работает. Кто-нибудь знает, как сделать это выпадающее меню. Пожалуйста, помогите мне решить эту проблему.

Спасибо

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropdown button
  </button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
    <a class="dropdown-item" href="#">Action</a>
    <a class="dropdown-item" href="#">Another action</a>
    <a class="dropdown-item" href="#">Something else here</a>
  </div>
</div>

Пример изображения

/* form starting stylings ------------------------------- */
.group 			  { 
  position:relative; 
  margin-bottom:45px; 
}
input 				{
  font-size:18px;
  padding:10px 10px 10px 5px;
  display:block;
  width:300px;
  border:none;
  border-bottom:1px solid #757575;
}
input:focus 		{ outline:none; }

/* LABEL ======================================= */
label 				 {
  color:#999; 
  font-size:18px;
  font-weight:normal;
  position:absolute;
  pointer-events:none;
  left:5px;
  top:10px;
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}

/* active state */
input:focus ~ label, input:valid ~ label 		{
  top:-20px;
  font-size:14px;
  color:#5264AE;
}

/* BOTTOM BARS ================================= */
.bar 	{ position:relative; display:block; width:300px; }
.bar:before, .bar:after 	{
  content:'';
  height:2px; 
  width:0;
  bottom:1px; 
  position:absolute;
  background:#5264AE; 
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}
.bar:before {
  left:50%;
}
.bar:after {
  right:50%; 
}

/* active state */
input:focus ~ .bar:before, input:focus ~ .bar:after {
  width:50%;
}

/* HIGHLIGHTER ================================== */
.highlight {
  position:absolute;
  height:60%; 
  width:100px; 
  top:25%; 
  left:0;
  pointer-events:none;
  opacity:0.5;
}

/* active state */
input:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}

/* ANIMATIONS ================ */
@-webkit-keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}
@-moz-keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}
@keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}

 <form>
    
    <div class="group">      
      <input type="text" required>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Name</label>
    </div>
      
    <div class="group">      
      <input type="text" required>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Email</label>
    </div>
    
  </form>

Ответ 1

Наконец я сделал это

/* form starting stylings ------------------------------- */
.group 			  { 
  position:relative; 
  margin-bottom:45px; 
}
input 				{
  font-size:18px;
  padding:10px 10px 10px 5px;
  display:block;
  width:300px;
  border:none;
  border-bottom:1px solid #757575;
}
select {
  font-size:18px;
  padding:10px 10px 10px 5px;
  display:block;
  width:300px;
  border:none;
  border-bottom:1px solid #757575;
}
input:focus 		{ outline:none; }
select:focus 		{ outline:none; }
/* LABEL ======================================= */
label 				 {
  color:#999; 
  font-size:18px;
  font-weight:normal;
  position:absolute;
  pointer-events:none;
  left:5px;
  top:10px;
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}

/* active state */
input:focus ~ label, input:valid ~ label 		{
  top:-20px;
  font-size:14px;
  color:#5264AE;
}
select:focus ~ label, select:valid ~ label 		{
  top:-20px;
  font-size:14px;
  color:#5264AE;
}
/* BOTTOM BARS ================================= */
.bar 	{ position:relative; display:block; width:300px; }
.bar:before, .bar:after 	{
  content:'';
  height:2px; 
  width:0;
  bottom:1px; 
  position:absolute;
  background:#5264AE; 
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}
.bar:before {
  left:50%;
}
.bar:after {
  right:50%; 
}

/* active state */
input:focus ~ .bar:before, input:focus ~ .bar:after {
  width:50%;
}
select:focus ~ .bar:before, select:focus ~ .bar:after {
  width:50%;
}

/* HIGHLIGHTER ================================== */
.highlight {
  position:absolute;
  height:60%; 
  width:100px; 
  top:25%; 
  left:0;
  pointer-events:none;
  opacity:0.5;
}

/* active state */
input:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}
select:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}
/* ANIMATIONS ================ */
@-webkit-keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}
@-moz-keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}
@keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">

<form>
    
    <div class="group">      
       <select class=" " id="exampleFormControlSelect1">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
      <option>5</option>
    </select>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Name</label>
    </div>
      
    <div class="group">      
      <input type="text" required>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Email</label>
    </div>
    
    
  </form>

Ответ 2

Чтобы придать ощущению материала выбрать, примените приведенные ниже стили к тегу select

CSS

select{
    border-bottom:1px solid #757575;
    -webkit-appearance: none;
    background: #fff;
    border-radius: 0;
   }

Пример

/* form starting stylings ------------------------------- */
.group 			  { 
  position:relative; 
  margin-bottom:45px; 
}


input 				{
  font-size:18px;
  padding:10px 10px 10px 5px;
  display:block;
  width:300px;
  border:none;
  border-bottom:1px solid #757575;
}
select {
  font-size:18px;
  padding:10px 10px 10px 5px;
  display:block;
  width:300px;
  border:none;
  border-bottom:1px solid #757575;
      -webkit-appearance: none;
    background: #fff;
    border-radius: 0;

}
input:focus 		{ outline:none; }
select:focus 		{ outline:none; }
/* LABEL ======================================= */
label 				 {
  color:#999; 
  font-size:18px;
  font-weight:normal;
  position:absolute;
  pointer-events:none;
  left:5px;
  top:10px;
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}

/* active state */
input:focus ~ label, input:valid ~ label 		{
  top:-20px;
  font-size:14px;
  color:#5264AE;
}
select:focus ~ label, select:valid ~ label 		{
  top:-20px;
  font-size:14px;
  color:#5264AE;
}
/* BOTTOM BARS ================================= */
.bar 	{ position:relative; display:block; width:300px; }
.bar:before, .bar:after 	{
  content:'';
  height:2px; 
  width:0;
  bottom:1px; 
  position:absolute;
  background:#5264AE; 
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}
.bar:before {
  left:50%;
}
.bar:after {
  right:50%; 
}

/* active state */
input:focus ~ .bar:before, input:focus ~ .bar:after {
  width:50%;
}
select:focus ~ .bar:before, select:focus ~ .bar:after {
  width:50%;
}

/* HIGHLIGHTER ================================== */
.highlight {
  position:absolute;
  height:60%; 
  width:100px; 
  top:25%; 
  left:0;
  pointer-events:none;
  opacity:0.5;
}

/* active state */
input:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}
select:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}
/* ANIMATIONS ================ */
@-webkit-keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}
@-moz-keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}
@keyframes inputHighlighter {
	from { background:#5264AE; }
  to 	{ width:0; background:transparent; }
}

<link rel="stylesheet" href="#" onclick="location.href='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css'; return false;" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">

<form>
    
    <div class="group">      
       <select class=" " id="exampleFormControlSelect1">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
      <option>5</option>
    </select>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Name</label>
    </div>
      
    <div class="group">      
      <input type="text" required>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Email</label>
    </div>
    
    
  </form>