textbox with dropdown bootstrap

<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>

<div class="input-group">
  <div class="input-group-prepend">
    <span class="input-group-text" id="">First and last name</span>
  </div>
  <input type="text" class="form-control">
  <input type="text" class="form-control">
</div>