.base-line-conn-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/tree-vertical-line-1.png') repeat-y 0 0;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/tree-vertical-line-1.png');
  _background: none;
}
.bi-theme-dark .base-line-conn-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/dark/tree-vertical-line-1.png') repeat-y 0 0;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/dark/tree-vertical-line-1.png');
  _background: none;
}
.first-line-conn-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/tree-vertical-line-2.png') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/tree-vertical-line-2.png');
  _background: none;
}
.bi-theme-dark .first-line-conn-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/dark/tree-vertical-line-2.png') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/dark/tree-vertical-line-2.png');
  _background: none;
}
.mid-line-conn-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/tree-vertical-line-3.png') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/tree-vertical-line-3.png');
  _background: none;
}
.bi-theme-dark .mid-line-conn-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/dark/tree-vertical-line-3.png') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/dark/tree-vertical-line-3.png');
  _background: none;
}
.last-line-conn-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/tree-vertical-line-4.png') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/tree-vertical-line-4.png');
  _background: none;
}
.bi-theme-dark .last-line-conn-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/dark/tree-vertical-line-4.png') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/dark/tree-vertical-line-4.png');
  _background: none;
}
.loading-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/icon/loading.gif') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/icon/loading.gif');
  _background: none;
}
.auto-color-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/background/auto-color.png') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/background/auto-color.png');
  _background: none;
}
.trans-color-background {
  background: url('https://fanruan.coding.me/fineui/dist/images/1x/background/trans-color.png') no-repeat center center;
  _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='https://fanruan.coding.me/fineui/dist/images/1x/background/trans-color.png');
  _background: none;
}