fix(ui): scrollbar color

src/main/frontend/components/container.css

@@ -790,7 +790,7 @@
 
   &::-webkit-scrollbar-thumb {
     border-radius: 8px;
-    border: 2px solid white; /* should match background, can't be transparent */
+    border: 2px solid var(--ls-primary-background-color, white); /* should match background, can't be transparent */
     background-color: rgba(0, 0, 0, .1);
 
     &:hover {