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

.chat-message-text.-deleted,
.chat-message-text.-hidden {
  margin-left: calc(var(--message-left-width) + 0.75em);
  padding: 0;

  .chat-message-expand {
    color: var(--primary-low-mid);
    padding: 0.25em;

    .d-button-label {
      text-align: left;
    }

    &:hover {
      background: inherit;
      color: inherit;
    }
  }
}

.chat-message-reaction {
  > * {
    pointer-events: none;
  }
}

[data-content][data-identifier="chat-message-reaction-tooltip"] {
  font-size: var(--font-down-1);

  .fk-d-tooltip__inner-content {
    display: block;
  }

  .emoji {
    padding-left: 0.25rem;
  }
}

.chat-message {
  align-items: flex-start;
  padding: 0.25em 0.5em 0.25em 0.75em;
  display: flex;
  min-width: 0;

  .chat-message-reaction {
    @include chat-reaction;
    will-change: scale;

    &:active {
      transform: scale(0.93);
    }
  }

  .chat-message-content {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    word-break: break-word;
    overflow-wrap: break-word;
    min-width: 0;
  }

  .chat-message-text {
    min-width: 0;
    width: 100%;

    code {
      box-sizing: border-box;
      font-size: var(--font-down-1);
      width: 100%;
    }

    .mention {
      @include mention;

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

    // Automatic aspect-ratio mapping https://developer.mozilla.org/en-US/docs/Web/Media/images/aspect_ratio_mapping
    p img:not(.emoji) {
      max-width: 100%;
      height: auto;
    }

    ul,
    ol {
      padding-left: 1.25em;
    }
  }

  .chat-message-edited {
    display: inline-block;
    color: var(--primary-medium);
    font-size: var(--font-down-2);
  }

  .chat-message-reaction-list,
  .chat-transcript-reactions {
    @include unselectable;
    margin-top: 0.25em;
    display: flex;
    flex-wrap: wrap;

    .chat-message-react-btn {
      vertical-align: top;
      padding: 0em 0.25em;
      background: none;
      border: none;
      will-change: scale;

      &:active {
        transform: scale(0.93);
      }

      > * {
        pointer-events: none;
      }

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

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

  .chat-message-avatar .chat-user-avatar .chat-user-avatar__container .avatar,
  .chat-emoji-avatar .chat-emoji-avatar-container {
    width: 28px;
    height: 28px;
  }
}

.touch .chat-message-container {
  &.-active {
    background: var(--d-hover);
    border-radius: var(--d-border-radius);

    &.-bookmarked {
      background: var(--highlight-low);
    }
  }
}

.no-touch .chat-message-container {
  &:hover,
  &.-active {
    background: var(--d-hover);
  }

  &:hover {
    .chat-message-reaction-list .chat-message-react-btn {
      display: inline-block;
    }
  }

  &.-active,
  &:hover {
    &.-bookmarked {
      background: var(--highlight-medium);
    }

    &.-deleted {
      background-color: var(--danger-medium);
    }

    &.-highlighted {
      background-color: var(--tertiary-medium);
    }
  }
}

.chat-message-container {
  background-color: var(--d-content-background, var(--secondary));
  width: 100%;

  &.-errored {
    color: var(--primary-medium);
  }

  &.-deleted {
    background-color: var(--danger-low);
    padding-block: 0.25rem;
  }

  &.-bookmarked {
    background: var(--highlight-bg);
  }

  &.-highlighted {
    background-color: var(--tertiary-low);
  }

  &.has-reply {
    .chat-message {
      display: grid;
      grid-template-columns: var(--message-left-width) 1fr;
      grid-template-rows: 30px auto;
      grid-template-areas:
        "replyto replyto"
        "avatar message";

      .chat-user-avatar {
        grid-area: avatar;
      }

      .chat-message-content {
        grid-area: message;
      }
    }
  }

  &.has-thread-indicator {
    .chat-message {
      display: grid;
      grid-template-columns: var(--message-left-width) 1fr;
      grid-template-rows: auto;
      grid-template-areas:
        "avatar message"
        "threadindicator threadindicator";
      padding-bottom: 0.65rem !important;

      .chat-user-avatar {
        grid-area: avatar;
      }

      .chat-message-content {
        grid-area: message;
      }
    }
  }

  .chat-message-reaction-list .chat-message-react-btn {
    display: none;
  }
}