File: public/js/tinymce/src/skins/lightgray/src/main/less/desktop/Sidebar.less

// Sidebar

.@{prefix}-edit-aria-container > .@{prefix}-container-body {
  display: flex;

  .@{prefix}-edit-area {
    flex: 1;
  }

  .@{prefix}-sidebar > .@{prefix}-container-body {
    display: flex;
    align-items: stretch;
    height: 100%;
  }

  .@{prefix}-sidebar-panel {
    min-width: 250px;
    max-width: 250px;
    position: relative;

    > .@{prefix}-container-body {
      position: absolute;
      width: 100%; height: 100%;
      overflow: auto;
      top: 0; left: 0;
    }
  }
}

.@{prefix}-sidebar-toolbar {
  border: 0 solid @panel-border;
  border-left-width: 1px;

  .@{prefix}-btn {
    border-left: 0;
    border-right: 0;
  }

  .@{prefix}-btn.@{prefix}-active, .@{prefix}-btn.@{prefix}-active:hover {
    background-color: @btn-bg-active;

    button, button i {
      color: @btn-primary-text;
      text-shadow: 1px 1px @btn-primary-text-shadow;
    }
  }
}

.@{prefix}-sidebar-panel {
  border: 0 solid @panel-border;
  border-left-width: 1px;
}