discourse/plugins/chat/assets/stylesheets/common/chat-scroll-to-bottom.scss

.chat-scroll-to-bottom {
  display: flex;
  justify-content: center;
  margin: 0 1rem;
  position: relative;

  &__arrow {
    display: flex;
    background: var(--primary-medium);
    border-radius: 100%;
    align-items: center;
    justify-content: center;
    height: 32px;
    width: 32px;
    position: relative;
  }

  &__button {
    align-items: center;
    justify-content: center;
    position: absolute;
    flex-direction: column;
    bottom: -25px;
    background: none;
    opacity: 0;
    transition: opacity 0.25s ease, transform 0.5s ease;
    transform: scale(0.1);
    padding: 0;
    z-index: z("dropdown");

    .d-icon {
      color: var(--secondary);
      margin-left: 1px; // "fixes" the 1px svg shift
    }

    > * {
      pointer-events: none;
    }

    &:hover,
    &:active,
    &:focus {
      background: none !important;
      .d-icon {
        color: var(--secondary) !important;
      }
    }

    .no-touch & {
      &:hover {
        opacity: 1;

        .d-icon {
          color: var(--primary-very-high) !important;
        }
      }
    }

    &.visible {
      transform: translateY(-32px) scale(1);
      opacity: 0.8;

      &:hover {
        transform: translateY(-32px) scale(1);

        &:active {
          transform: translateY(-32px) scale(0.8);
        }
      }
    }
  }
}