discourse/app/assets/stylesheets/common/components/banner.css.scss

// --------------------------------------------------
// Banner
// --------------------------------------------------

#banner, .banner {
  padding: 10px;
  border-radius: 5px;
  background: scale-color($tertiary, $lightness: 90%);
  box-shadow: 0 1px 2px scale-color($tertiary, $lightness: 70%);
  color: darken($tertiary, 45%);
  z-index: 501;
  overflow: auto;

  &.overlay {
    position: fixed;
  }

  .close {
    font-size: 1.786em !important;
    margin-top: -10px !important;
    color: darken($tertiary, 45%);
  }

  .meta {
    display: none;
  }
}