<div class="mb-3">
  <label class="form-label" for="defaultFile">Choose file</label>
  <input type="file" class="form-control" id="defaultFile">
</div>

<!-- small input file -->
<input type="file" class="form-control form-control-sm" id="smFile">

<!-- large input file -->
<input type="file" class="form-control form-control-lg" id="lgFile">