discourse/plugins/chat/assets/stylesheets/common/chat-channel.scss

.chat-channel {
  display: flex;
  flex-direction: column;
  min-height: 1px;
  position: relative;
  overflow: hidden;
  grid-area: main;
  width: 100%;
  min-width: 250px;
  height: calc(
    var(--chat-vh, 1vh) * 100 - var(--header-offset, 0px) -
      var(--composer-height, 0px) - var(--chat-draft-header-height, 0px) -
      var(--chat-direct-message-creator-height, 0px)
  );

  .footer-nav-ipad & {
    height: calc(
      var(--chat-vh, 1vh) * 100 - var(--header-offset, 0px) -
        var(--footer-nav-height, 0px) - var(--chat-draft-header-height, 0px) -
        var(--chat-direct-message-creator-height, 0px)
    );
  }

  .open-drawer-btn,
  .open-thread-list-btn {
    color: var(--primary-low-mid);

    &:visited {
      color: var(--primary-low-mid);
    }

    &:hover {
      color: var(--primary);
    }

    > * {
      pointer-events: none;
    }
  }

  .open-thread-list-btn {
    .d-icon {
      margin-right: 0;
    }

    &:hover {
      .discourse-touch & {
        background: none !important;
      }
    }

    &:active {
      .discourse-touch & {
        background: var(--secondary-very-high) !important;
      }
    }
  }

  .chat-messages-scroll {
    flex-grow: 1;
    overflow-y: scroll;
    overscroll-behavior: contain;
    display: flex;
    flex-direction: column-reverse;
    z-index: 1;
    margin: 0 1px 0 0;
    will-change: transform;
    @include chat-scrollbar();

    .join-channel-btn.in-float {
      position: absolute;
      transform: translateX(-50%);
      left: 50%;
      top: 10px;
      z-index: 10;
    }

    .all-loaded-message {
      text-align: center;
      color: var(--primary-medium);
      font-size: var(--font-down-1);
      padding: 0.5em 0.25em 0.25em;
    }
  }

  .scroll-stick-wrap {
    display: flex;
    justify-content: center;
    margin: 0 1rem;
    position: relative;
  }

  .chat-scroll-to-bottom {
    align-items: center;
    justify-content: center;
    position: absolute;
    z-index: 1;
    flex-direction: column;
    bottom: -25px;
    background: none;
    opacity: 0;
    transition: opacity 0.25s ease, transform 0.5s ease;
    transform: scale(0.1);
    padding: 0;

    > * {
      pointer-events: none;
    }

    &:hover,
    &:active,
    &:focus {
      background: none !important;
    }

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

    &__text {
      color: var(--secondary);
      padding: 0.5rem;
      margin-bottom: 0.5rem;
      background: var(--primary-medium);
      border-radius: 3px;
      text-align: center;
      font-size: var(--font-down-1);
      bottom: 40px;
      position: absolute;
    }

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

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

    &:hover {
      opacity: 1;

      .chat-scroll-to-bottom__arrow {
        .d-icon {
          color: var(--secondary);
        }
      }
    }
  }
}