admin/public/plugins/element-plus/theme-chalk/src/overlay.scss

@use 'mixins/mixins' as *;
@use 'common/var' as *;

@include b(overlay) {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2000;
  height: 100%;
  background-color: getCssVar('overlay-color', 'lighter');
  overflow: auto;
  #{& + '-root'} {
    height: 0;
  }
}