discourse/plugins/chat/assets/stylesheets/common/sidebar-extensions.scss

// Styles to make channels list in sidebar match sidebar theme
.chat-enabled {
  .has-sidebar {
    .sidebar-header {
      .d-header .menu-panel {
        top: calc(3.4em - 2px) !important;
      }
      .d-header-icons .icon {
        width: 2em;
        height: 2em;
        img.avatar,
        #logo-small {
          width: 2em;
          height: 2em;
        }
      }
    }
    .header-dropdown-toggle.chat-header-icon {
      .chat-channel-unread-indicator {
        border-color: var(--primary-very-low);
      }
    }
    .sidebar-container {
      .channels-list {
        .chat-channel-divider {
          padding: 0 0.5em 0 1.75rem;
        }
        .chat-channel-row {
          padding-right: 0.75em;
        }
        .chat-channel-leave-btn {
          padding: 0;
        }
      }
    }
  }

  .sidebar-section-wrapper.sidebar-section[data-section-name="my-threads"] {
    .sidebar-section-content {
      padding-bottom: 0;
    }
  }

  .sidebar-container {
    .channels-list {
      color: var(--primary);
      font-size: var(--font-down-1);
      padding-bottom: 2em;
      width: 100%;
      overflow-x: hidden;

      .chat-channel-divider {
        padding: 0 1.75rem;

        &:hover {
          .title-caret {
            opacity: 1;
          }
        }
      }

      .channels-list-container {
        margin-bottom: 1rem;
      }

      .channel-list-empty-message {
        margin: 0;
        padding: 0em 2em 0.5em;
      }

      .chat-channel-row:not(.active) {
        &:hover {
          .category-chat-private {
            .d-icon {
              background-color: var(--primary-low);
            }
          }
        }
        .category-chat-private {
          .d-icon {
            background-color: var(--primary-very-low);
          }
        }
      }

      .open-new-message-btn,
      .open-browse-page-btn,
      .edit-channels-dropdown .select-kit-header,
      .chat-channel-leave-btn {
        display: flex;
        padding: 0.25em;
        border-radius: 0.25em;

        &:hover {
          background-color: var(--primary-low);

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

        .d-icon {
          color: var(--primary-medium);
          font-size: var(--font-down-1);
          padding: 0.25em;
        }
      }

      .chat-channel-leave-btn {
        padding-top: 0;
        padding-bottom: 0;
        height: 100%;
        border-radius: 0;

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

      .chat-channel-row {
        padding-left: calc(1.8rem / 2);
        margin-left: calc(1.8rem / 2);
        border-radius: 0.25em;
        padding-right: 1.8rem;
        min-height: 28px;
        margin-bottom: 0.125rem;

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

        .chat-channel-title {
          padding: 0.25rem;
          font-weight: unset;
          margin: 0;
        }
      }
    }
  }
}

.chat-enabled {
  .sidebar-section-link-prefix {
    .prefix-image {
      border: 1px solid transparent;
    }

    &.active .prefix-image {
      box-shadow: 0px 0px 0px 1px var(--success);
    }
  }

  .sidebar-section-link--active {
    background: var(--primary-low);
  }

  .sidebar-section-link--muted {
    opacity: 0.5;

    .sidebar-section-link-prefix.icon .d-icon {
      color: var(--primary-medium);
    }

    &.active {
      .sidebar-section-link-prefix.icon .d-icon {
        color: var(--primary-high);
      }
    }
  }
}