discourse/plugins/chat/assets/stylesheets/mobile/chat-message-actions.scss

.chat-message-actions {
  position: absolute;
  bottom: -100vh;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  border-radius: 8px 8px 0 0;
  margin: 0 2px;
  transition: bottom 0.2s ease;

  .selected-message-container {
    padding: 0.5em 0.5em 1em 0.5em;
  }

  .selected-message {
    display: flex;
    align-items: center;
    padding: 0.5em;
    border: 1px solid var(--primary-low);
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.125);
    border-radius: 8px;

    .selected-message-reply {
      &:not(.is-expanded) {
        @include ellipsis;
      }

      &.is-expanded {
        @include user-select(text);
        max-height: 80px;
        overflow-y: scroll;
      }
    }
  }

  .main-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1em 1em 1.5em 1em;

    .chat-message-reaction {
      background: none;
      border: 1px solid transparent;

      img.emoji {
        width: 30px;
        height: 30px;
        object-fit: contain;
      }

      &.reacted {
        border-color: var(--tertiary-medium);
        background: var(--tertiary-very-low);
        color: var(--tertiary-hover);

        &:hover {
          background: var(--tertiary-low);
        }
      }
    }

    .react-btn {
      .d-icon {
        color: var(--primary-medium);
        font-size: var(--font-up-4);
      }
    }

    .chat-message-reaction,
    .react-btn {
      margin: 0;
    }

    .chat-message-reaction,
    .reply-btn,
    .react-btn,
    .bookmark-btn {
      flex-grow: 1;
      height: 42px;
    }

    .bookmark-btn,
    .react-btn {
      > .svg-icon-title,
      > .svg-icon {
        font-size: var(--font-up-4);
      }
    }

    .reply-btn {
      border-radius: 3px;
      .d-icon {
        font-size: var(--font-up-4);
      }
    }
  }

  .secondary-actions {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 0.5em;
    margin: 0;

    .chat-message-action-item {
      border-bottom: 1px solid var(--primary-low);
      width: 100%;
      list-style: none;
      padding-bottom: 0.25em;
      margin-bottom: 0.25em;
      display: flex;

      &:last-child {
        border: 0;
        margin: 0;
        padding: 0;
      }

      .chat-message-action {
        justify-content: flex-start;
        background: none;
        width: 100%;
        border: 0;
        color: var(--primary);

        &:focus,
        .d-icon {
          color: var(--primary);
        }
      }
    }
  }
}

.chat-message-actions-backdrop {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100%;
  width: 100%;
  z-index: z("header") + 1;
  transition: background-color 0.2s ease;

  .collapse-area {
    width: 100%;
    height: 100%;
  }

  &.fade-in {
    background-color: rgba(0, 0, 0, 0.35);

    .chat-message-actions {
      bottom: 0;
    }
  }
}