"Move placeholder to top while focus input"
Bootstrap 4.1.1 Snippet by thangytp

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div>
<input type="text" class="inputText" required/>
<span class="floating-label">Your email address</span>
</div>
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input:focus ~ .floating-label,
input:not(:focus):valid ~ .floating-label{
top: 2px;
bottom: 16px;
left: 12px;
font-size: 11px;
opacity: 1;
}
.inputText {
font-size: 14px;
width: 200px;
height: 50px;
}
.floating-label {
position: absolute;
pointer-events: none;
left: 20px;
top: 10px;
transition: 0.2s ease all;
}
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