bootstrap form input select
<div class="col-lg-6 col-md-6 col-12"> <div class="input-group mb-3"> <div class="input-group-prepend"> <select class="form-control select2bs4" name="country_code" id="country_code" style="width: 100%"> <option value="+91">+91</option> <option value="+351">+351</option> <option value="+1">+1</option> </select> </div> <input type="text" name="user" class="form-control" placeholder="Email Or Mobile Number"> </div> </div>