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

// TabPanel

.@{prefix}-tabs {
  display: block;
  border-bottom: 1px solid @tab-border;
}

.@{prefix}-tabs,
.@{prefix}-tabs + .@{prefix}-container-body {
  background: @tabs-bg;
}

.@{prefix}-tab {
  .inline-block();
  border: 1px solid @tab-border;
  border-width: 0 1px 0 0;
  background: @tab-bg;
  padding: 8px 15px;
  text-shadow: @text-shadow;
  height: 13px;
  cursor: pointer;
}

.@{prefix}-tab:hover {
  background: @tab-bg-hover;
}

.@{prefix}-tab.@{prefix}-active {
  background: @tab-bg-active;
  border-bottom-color: transparent;
  margin-bottom: -1px;
  height: 14px;

}

.@{prefix}-tab:focus {
  color: #2276d2;
}

// RTL

.@{prefix}-rtl .@{prefix}-tabs {
  text-align: right;
  direction: rtl;
}

.@{prefix}-rtl .@{prefix}-tab {
  border-width: 0 0 0 1px;
}