Flattened the sidebar tree

src-web/components/DropMarker.tsx

@@ -1,14 +1,17 @@
 import classNames from 'classnames';
+import type { CSSProperties} from 'react';
 import React, { memo } from 'react';
 
 interface Props {
   className?: string;
+  style?: CSSProperties;
 }
 
 export const DropMarker = memo(
-  function DropMarker({ className }: Props) {
+  function DropMarker({ className, style }: Props) {
     return (
       <div
+        style={style}
         className={classNames(
           className,
           'relative w-full h-0 overflow-visible pointer-events-none',