🎨 Clean up UI for 2x branch

Please apply along side the bootstrap_styles patch found here;

For 1x users; https://www.drupal.org/project/bootstrap_styles/issues/3353004 🐛 🎨 Clean up UI for 1x branch RTBC
For 2x users; https://www.drupal.org/project/bootstrap_styles/issues/3352809 📌 🎨 Clean up UI for 2x branch Needs review

Attaching patch to use in composer.json

It looks like code from the patch is already applied to the latest released version, except for

#drupal-off-canvas {
  overflow: auto !important;
}

andre.bonon → made their first commit to this issue’s fork.

Attaching a patch to use in composer.json with the 2.1.2 version.