add scrollbar, background and padding to sidebar

sugarcube/src/style/interface.css

@@ -34,6 +34,9 @@
 
 #sidebar{
 	grid-area: sidebar;
+	overflow: auto;
+	background: rgba(20, 20, 20, 0.5);
+	padding: 0em 0.3em;
 }
 
 #topbar{