discourse/plugins/chat/assets/stylesheets/mobile/chat-channel-row.scss

.chat-channel-row {
  margin: 0;
  border-radius: 0;
  border-bottom: 1px solid var(--primary-low);
  transition: height 0.25s ease-in-out, opacity 0.25s ease-out;
  transform-origin: top center;
  will-change: height, opacity, left;
  height: 4em;
  position: relative;

  &.-fade-out {
    .chat-channel-row__content {
      background-color: var(--danger-low);
    }

    height: 0 !important;
    overflow: hidden;
    opacity: 0.5 !important;
  }

  &__content {
    display: flex;
    flex-grow: 1;
    padding-inline: 1.5rem;
    z-index: 2;
    background: var(--primary-very-low);
    box-sizing: border-box;
    height: 100%;
    transition: border-radius 0.25s ease-in-out;

    &.-animate-reset {
      transition: margin-right 0.15s ease-out;
      margin-right: 0px !important;
    }
  }

  &__action-btn {
    z-index: 1;
    display: flex;
    align-items: center;
    position: absolute;
    top: 0px;
    bottom: 0px;
    right: 0px;
    left: 0px;
    background: var(--danger);
    color: var(--primary-very-low);

    .d-icon {
      transform-origin: 50% 50%;
      transform-box: fill-box;
      transition: scale 0.2s ease-out;
      margin: 0 1rem 0 auto;
      padding-left: 1rem;
    }

    &.-not-at-threshold {
      .d-icon {
        scale: 0.7;
      }
    }

    &.-at-threshold {
      .d-icon {
        scale: 1.5;
      }
    }
  }

  .chat-channel-metadata {
    .chat-channel-unread-indicator {
      font-size: var(--font-down-2);
      margin-top: 0.25rem;
    }
    &__date {
      font-size: var(--font-down-2);
    }
  }
}