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

.chat-channel-icon {
  flex-shrink: 0;
  &.--users-count {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(var(--primary-rgb), 0.1);
    box-sizing: border-box;
    color: var(--primary-high);
    padding: 0;

    .chat-channel-row & {
      width: var(--channel-list-avatar-size);
      height: var(--channel-list-avatar-size);
      font-size: var(--font-up-1);
    }
  }

  .chat-user-avatar {
    .avatar {
      .chat-channel-row & {
        width: var(--channel-list-avatar-size);
        height: var(--channel-list-avatar-size);
      }
    }
  }

  &.--category-badge {
    color: var(--primary-medium);
    display: flex;
    font-size: var(--font-up-1);
    position: relative;

    .chat-message-creator & {
      justify-content: center;
      width: 24px;
    }
  }

  &__restricted-category-icon {
    background-color: var(--secondary);
    position: absolute;
    border-radius: 50%;
    padding: 2px 2px 3px;
    color: var(--primary-high);
    height: 0.5rem;
    width: 0.5rem;
    right: -0.5rem;
    top: -0.1rem;
  }
}