JSFiddle - React, Tailwind, and code Playground

by Dedi Wibisono

HTML

<script src="https://code.jquery.com/jquery-3.4.1.slim.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css">
<div class="container">
<div class="row">
  <div class="col-md-8 offset-md-2">
    <div class="form-group">
      <input type="text" class="form-control" placeholder="your name">
    </div>     
    <div class="form-group">
      <select name="" id="" class="form-control">
        <option value="male">Male</option>
        <option value="female">Female</option>
      </select>
    </div>     
  </div>
</div>
<div class="overlay-bg"></div>

</div>

CSS

.overlay-bg {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 0;
    background: transparent;
    pointer-events: none;
    transition: .1s ease-out;
}
.is-active {
        z-index: 115;
        background: rgba(0, 0, 0, .35);
        pointer-events: all;
        cursor: pointer;
}    

.dedi {
  background: white;
  position: relative;
  z-index: 120;
}

JavaScript

$(".form-control").focusin(function() {
    $(".overlay-bg").addClass('is-active')
         $(this).addClass('dedi')
})

$(".form-control").focusout(function() {
    $(".overlay-bg").removeClass('is-active');
    $(this).removeClass('dedi')
    
})