JSFiddle - React, Tailwind, and code Playground

HTML

<div class='form-group'>
  <label class='control-label' for='numParcelas'>PARCELAS*</label>
  <input type='text' class='form_campos form_campos_numeros' id='numParcelas' name='numParcelas'>
</div>

<br><br><br><br><br><br>

<div class='box'>
  <label class='control-label' for='auto'>FORNECEDOR*</label>
  <input type='text' class='form_campos_box' id='auto' name='nome'>
  <div class="box_bt">
    <i class='demo-icon'>X</i>
  </div>
</div>

CSS

body {
      font-family: Verdana;
      font-size: 12px;
    }
    
    .form-group {
      position: relative;
      display: flex;
      height: 45px;
      float: left;
      margin-right: 2px;
    }
    
    .control-label {
      opacity: 0.4;
      pointer-events: none;
      position: absolute;
      transform: translate3d(5px, 22px, 0) scale(1);
      transform-origin: left top;
      transition: 240ms;
      z-index: 2;
    }
    
    .form-group.focused .control-label {
      opacity: 1;
      transform: scale(0.75);
    }
    
    .form_campos {
      height: 20px;
      color: #484848;
      z-index: 1;
      align-self: flex-end;
      font-size: 15px;
      padding: 5px;
      outline: none;
      border-color: #484848;
      border-style: solid;
      border-bottom-width: 1px;
      border-top-width: 0;
      border-right-width: 0;
      border-left-width: 0;
      background: transparent;
    }
    
    .form_campos:hover,
    .form_campos:focus {
      border-color: #1E90FF;
    }
    
    .form_campos_numeros {
      width: 123px;
    }
   
   
   
    /* BOX INPUT E BOTAO */
    
    .box {
      width: 250px;
      display: flex;
      height: 44px;
      border-color: #484848;
      border-style: solid;
      border-bottom-width: 1px;
      border-top-width: 0;
      border-right-width: 0;
      border-left-width: 0;
    }
    
    .box input {
      outline: 0;
      width: 230px;
      height: 20px;
      border: 0;
      background: transparent;
    }
    
    .box_bt {
      margin-top: 28px;
      cursor: pointer;
    }
    
    .box_bt:hover {
      color: #1E90FF;
    }
    
    .box:hover {
      border-color: #1E90FF;
    }
    
    .box.focused .control-label {
      opacity: 1;
      transform: scale(0.75);
    }
    
    .form_campos_box {
      color: #484848;
      z-index: 1;
      align-self: flex-end;
      font-size: 15px;
      padding: 5px;
      position: relative;
      display: block;
      outline: none;
    }
    /*...

JavaScript

$('.form_campos').on('focus blur', function(e) {
  $(this).parents('.form-group').toggleClass('focused', (e.type === 'focus' || this.value.length > 0));
}).trigger('blur');

$('.form_campos_box').on('focus blur', function(e) {
  $(this).parents('.box').toggleClass('focused', (e.type === 'focus' || this.value.length > 0));
}).trigger('blur');