Forms

Normalize.css

button, input, optgroup, select, textarea {
  font-family: inherit;
  font-size: 100%;
  line-height: 1.15;
  margin: 0;
}

https://developer.mozilla.org/en-US/docs/Learn/Forms/Styling_web_forms

Form.css

button, input, optgroup, select, textarea {
  border: 1px solid black;
  background-color: white;
  color: black;
  padding: .25rem;
  border-radius: 0;
  line-height: 1.25;
  font-weight: normal;
}

Inline Form

inline-form.css

.form--inline

This is provided by starterkit.

Example: views exposed filters.

Node edit

Registration

Create content type

Moved machine name under name field.

#edit-name-machine-name-suffix, /* Content types, Vocabulary */
#edit-label-machine-name-suffix /* Menus, Roles */ {
  display: block;
  margin-bottom: .25rem;
}