angular-docs-cn/public/resources/css/module/_code-box.scss

.code-box {
  border-radius: 4px;
  background: $lightgrey;
  // box-shadow: 0px 2px 5px rgba($coal, .3);
  margin-bottom: $unit * 2;

  header {
    background: $fog;
    color: $snow;
    padding: $unit $unit 0px $unit;
    border-radius: 4px 4px 0px 0px;
  }

  nav {
    button {
      line-height: $unit * 3.5;
      height: $unit * 3.5;
      padding: 0px ($unit * 3);
      margin-right: $unit;
      font-size: 13px;
      background: $grey;
      color: $snow;
      border-radius: 4px 4px 0px 0px;
      // font-weight: 500;
      text-transform: none;

      &.is-selected,
      &.selected
       {
        background: $lightgrey;
        color: $darkgrey;
      }
    }
  }

  .prettyprint {
    box-shadow: none;
    margin: 0px;
  }
}