ui: scrollbar styling

Author: zjp-CN

ui/app/assets/css/main.css

@@ -5,3 +5,22 @@ html, body {
   overflow: hidden; /* forbid scrolling */
 }
 
+/* Scrolbar Styling */
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+::-webkit-scrollbar-thumb {
+  background-color: var(--p-button-primary-background);
+  border-radius: 8px;
+}
+::-webkit-scrollbar-track {
+  background-color: transparent;
+}
+::-webkit-scrollbar-button {
+  width: 0;
+  height: 0;
+}
+::-webkit-scrollbar-corner {
+  background-color: transparent;
+}