Стилизация плагина `select2`

$(document).ready(function(){ 
  $('.__select2').select2({ 
        placeholder: 'Select an Industry', 
        allowClear: false, 
        tags: true, 
        maximumSelectionLength: 5 
    }); 
});

.select2-container--default .select2-selection--multiple .select2-selection__rendered { 
    position: absolute; 
    top: 100%; 
    height: 0; 
    overflow: visible !important; 
    white-space: nowrap !important; 
} 
 
.select2-container--default .select2-selection--multiple .select2-selection__choice { 
    float: none !important; 
    display: inline-block; 
    position: relative; 
} 
 
.select2-container--default .select2-selection--multiple .select2-selection__choice__remove { 
    position: absolute; 
    right: -8px; 
    top: -14px; 
} 
 
.select2-container .select2-search--inline { 
    position: absolute; 
    top: -100%; 
    transform: translateY(-100%); /*тут через calc можно подровнять или через margin*/ 
    width: 90% !important; 
} 
 
.select2-container--default .select2-search--inline .select2-search__field{ 
    max-width: 100% !important; 
}

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script> 
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script> 
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"> 
 
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/css/select2.min.css"> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/js/select2.min.js"></script> 
<select class="__select2" multiple="multiple"> 
  <option>OAO & PHP</option> 
  <option>OAO & MySQL</option> 
  <option>OAO & Apache</option> 
  <option>OAO & Java</option> 
</select>