学习设置滚动条样式！

code/web/car_dealer/css/todo-list/to-list.css

@@ -2,7 +2,7 @@
  * @Author: Kane
  * @Date: 2022-10-21 16:39:27
  * @LastEditors: Kane
- * @LastEditTime: 2022-10-22 01:23:49
+ * @LastEditTime: 2022-10-22 01:49:12
  * @FilePath: \car_dealer\css\todo-list\to-list.css
  * @Description: 用于待办事项页面的css！
  * 
@@ -21,6 +21,9 @@ html {
 
     --light-shadow: #cfcfcf;
     --dark-shadow: #afafaf;
+
+    --scrollbar-backupground-color: #cfcfcf7f;
+    --scrollbar-track-color: #f7f7f700;
 }
 
 .border {
@@ -70,24 +73,26 @@ hr {
 .border > .todo_list {
     margin-top: 1rem;
     height: 12.2rem;
-    overflow-y: auto;
+    overflow-y: overlay;
 }
 
 .todo_list::-webkit-scrollbar {
     width: 10px;
-    height: 100px;
+    /* height: 100px; */
 }
 
-.todo_list::-webkit-scrollbar-thumb {
+.todo_list:hover::-webkit-scrollbar-thumb {
     border-radius: 10px;
-    -webkit-box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
-    background: #535353;
+    -webkit-box-shadow: inset 0 0 5px var(--scrollbar-track-color);
+    box-shadow: 0 0 5px var(--scrollbar-track-color);
+    background: var(--scrollbar-backupground-color);
 }
 
-.todo_list::-webkit-scrollbar-track {
-    -webkit-box-shadow: inset 0 0 5px var(--backupground-color);
-    border-radius: 10px;
-    background: #ededed;
+.todo_list:hover::-webkit-scrollbar-track {
+    /* -webkit-box-shadow: inset 0 0 5px var(--scrollbar-backupground-color);
+    box-shadow: 0 0 5px var(--scrollbar-backupground-color);
+    border-radius: 10px; */
+    background: var(--scrollbar-track-color);
 }
 
 .border > .todo_list > * + * {