<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 ----------> <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/js/select2.min.js"></script> <div class="container"> <div class="row"> <form class="col-md-4"> <label>Select</label> <select class="form-control select2"> <option>Select</option> <option>Car</option> <option>Bike</option> <option>Scooter</option> <option>Cycle</option> <option>Horse</option> </select> </form> </div> </div> <script> $('.select2').select2(); </script>

.select2-container .select2-selection--single{ height:34px !important; } .select2-container--default .select2-selection--single{ border: 1px solid #ccc !important; border-radius: 0px !important; }