Input size smaller than "form-control-sm" in bootstrap 4 e.g. xs?

Question

Is there a class to use to size dropdowns, input fields etc with something smaller than form-control-sm? I don't see any, so custom class is needed?

I'm using the CDN for bootstrap4 css and want to use a default font size of .75em for all text, but the bootstrap inputs are getting rendered at .875em.

What is a good way to override this and make them match?

Answer 1

You'd have to go the custom way

A good way can be to cut down other things in addition to cutting down the font size from .875em to .75em; this would include the height, padding too.

  .form-control-xs {
    height: calc(1em + .375rem + 2px) !important;
    padding: .125rem .25rem !important;
    font-size: .75rem !important;
    line-height: 1.5;
    border-radius: .2rem;
}

  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>


<div class="container">
  <h2>Form Control Sizing</h2>
  <p>Change the size of the form control with .form-control-sm or .form-control-lg:</p>
  <form action="/action_page.php">
    <div class="form-group">
      <input type="text" class="form-control form-control-xs" placeholder="Extra small form control" name="text0">
    </div>
    <div class="form-group">
      <input type="text" class="form-control form-control-sm" placeholder="Small form control" name="text1">
    </div>
    <div class="form-group">
      <input type="text" class="form-control" placeholder="Default form control" name="text2">
    </div>
    <div class="form-group">
      <input type="text" class="form-control form-control-lg" placeholder="Large form control" name="text3">
    </div>

  </form>
</div>