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

.chat-message-creator {
  &__open-dm-btn {
    width: 100%;
    max-width: 100%;
  }

  &__row {
    padding-block: 0.5rem;
  }

  .chat-channel-title__name,
  .chat-user-display-name {
    font-size: var(--font-up-1);
  }

  .chat-channel-title__category-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-inline: 2px;
    width: 24px;
    height: 24px;

    svg:not(.chat-channel-title__restricted-category-icon) {
      height: inherit;
      width: inherit;
    }
  }

  .chat-user-avatar {
    &__container {
      padding: 0;
    }
    img {
      width: 28px;
      height: 28px;
      box-sizing: border-box;
    }
  }
}