input group with button bootstrap 4.3.1 input-group-addon code example
Example: textbox with dropdown bootstrap
<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>