优化样式

Public/Admin/css/style.css

@@ -294,7 +294,21 @@ background-color:#3F97C9;
     
     background-color:#F0F9FD;
     max-height: 400px;
-    overflow-y: scroll;
+    overflow: auto;
+}
+::-webkit-scrollbar {
+    width: 12px;
+    height: 12px;
+}
+::-webkit-scrollbar-corner {
+    background-color: transparent;
+}
+::-webkit-scrollbar-thumb {
+    height: 6px;
+    border-radius: 7px;
+    border: 3px solid transparent;
+    background-color: #ddd;
+    background-clip: padding-box;
 }
 .side-sub-menu > li {
     position: relative;