JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.css">
<div class="col-sm-4">
     <label for="mobile" class="control-label"><span class="text-danger">*</span> Nationality</label>
     <input type="text" id="nationality" name="nationality" class="form-control input-lg" />
</div>

<div class="col-sm-4 padding-minimum">
     <label for="mobile" class="control-label"><span class="text-danger">*</span> Gender</label>
     <select name="gender" id="gender" class="form-control select2-container input-lg step2-select" data-placeholder="Select Gender">
         <option></option>
         <option value="1">Male</option>
         <option value="0">Female</option>
     </select>
</div>

CSS

.input-lg {
    height: 46px;
    padding: 10px 16px;
    font-size: 18px;
    line-height: 1.33;
    border-radius: 6px;
}
.select2-container--default .select2-selection--single {
    height: 46px;
    padding: 10px 16px;
    font-size: 18px;
    line-height: 1.33;
    border-radius: 6px;
}
.select2-container--default .select2-selection--single .select2-selection__arrow b {
    top: 85%;
}
.select2-container--default .select2-selection--single .select2-selection__rendered {
    line-height: 22px;
}
.select2-container--default .select2-selection--single {
    border: 1px solid #CCC;
box-shadow: 0px 1px 1px rgba(0, 0, 0, 0.075) inset;
transition: border-color 0.15s ease-in-out 0s, box-shadow 0.15s ease-in-out 0s;
}

JavaScript

$(document).ready(function(){
    $('select').select2();
  });