discourse/app/assets/stylesheets/common/base/composer-user-selector.scss

div.ac-wrap.composer-user-selector-limited {
  width: 400px;
  padding: 0 10px;
  margin-bottom: 5px;
  .btn-primary {
    margin-left: 0.5em;
    padding: 3px 6px 2px;
    font-size: $font-down-1;
    min-height: unset;
  }
}
UX: Collapse users when composing a private message. 2016-06-28 16:14:06 +08:00			`div.ac-wrap.composer-user-selector-limited {`
			`width: 400px;`
UX: Reducing usage of btn-small, simplifying styles 2019-01-12 08:41:09 +08:00			`padding: 0 10px;`
			`margin-bottom: 5px;`
			`.btn-primary {`
			`margin-left: 0.5em;`
			`padding: 3px 6px 2px;`
			`font-size: $font-down-1;`
			`min-height: unset;`
UX: Collapse users when composing a private message. 2016-06-28 16:14:06 +08:00			`}`
			`}`