Merge pull request #620 from SVG-Edit/issue-#609

customize left scroll bar

src/editor/svgedit.css

@@ -335,14 +335,27 @@ hr {
 #tools_left {
   grid-area: left;
   border-right: none;
-  overflow-y: auto;
-  scrollbar-width: thin;
+  overflow-y: scroll;
+  /* Works on Firefox */
+  scrollbar-width: 3px;
+  scrollbar-color: rgb(70, 70, 70) auto;
 }
-/* width */
-#tools_left ::-webkit-scrollbar {
+
+/* Scrollbar styling on Chrome, Edge, and Safari */
+#tools_left::-webkit-scrollbar {
   width: 3px;
 }
 
+#tools_left::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+#tools_left::-webkit-scrollbar-thumb {
+  background-color:rgb(70, 70, 70);
+}
+
+/* End scrollbar styling */
+
 /*—————————————————————————————*/
 
 #workarea.wireframe #svgcontent * {