input field small bootstrap code example

Example 1: large input box bootstrap 4

.form-control-sm
.form-control-lg

Example 2: boostrap input

<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>