metamask-extension/ui/components/app/tab-bar/index.scss

.tab-bar {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;

  &__tab {
    @include Paragraph;

    color: var(--color-text-default);
    display: flex;
    flex-flow: row nowrap;
    align-items: center;
    min-width: 0;
    flex: 0 0 auto;
    box-sizing: border-box;
    transition: opacity 200ms ease-in-out;
    background-color: unset;
    text-align: start;
    position: relative;

    @include screen-sm-max {
      @include H4;

      opacity: 1;
    }

    &__selected-indicator {
      width: 4px;
      height: calc(100% - 8px);
      position: absolute;
      top: 4px;
      left: 4px;
    }

    &__content {
      display: flex;
      align-items: center;
      position: relative;

      &__title {
        @include H4;

        @include screen-sm-min {
          @include H6;
        }
      }

      &__description {
        display: none;

        @include screen-sm-max {
          @include H6;

          display: block;
          font-weight: 300;
          margin-top: 8px;
          min-height: 14px;
        }
      }

      &__icon {
        display: flex;
        justify-content: center;
        margin-inline-end: 16px;
        flex: 0 0 18px;
      }
    }

    &__caret {
      display: none;

      @include screen-sm-max {
        display: block;
        margin-inline-start: auto;
        margin-inline-end: 8px;

        [dir='rtl'] & {
          transform: rotate(180deg);
        }
      }
    }

    &--active {
      opacity: 1 !important;

      @include screen-sm-min {
        background-color: var(--color-primary-muted);
      }
    }
  }

  &__grow-tab {
    flex-grow: 1;
  }
}