diff --git a/style.css b/style.css
index 1c662f3..cb7ea6d 100644
--- a/style.css
+++ b/style.css
@@ -4595,21 +4595,33 @@ html.darkmode .tippy-box[data-theme~="light"] {
 /*侧栏文章目录*/
 
 #leftbar_catalog {
-
 	margin-left: -5px;
-
 	width: calc(100% + 0px);
-
 	height: auto;
+	max-height: calc(100vh - 400px); /* 限制最大高度，为 TODO 和底部留出空间 */
+	overflow-y: auto;
+}
 
+#leftbar_catalog::-webkit-scrollbar {
+	width: 4px;
+}
+
+#leftbar_catalog::-webkit-scrollbar-track {
+	background: transparent;
+}
+
+#leftbar_catalog::-webkit-scrollbar-thumb {
+	background-color: rgba(0, 0, 0, 0.15);
+	border-radius: 2px;
+}
+
+html.darkmode #leftbar_catalog::-webkit-scrollbar-thumb {
+	background-color: rgba(255, 255, 255, 0.15);
 }
 
 #leftbar_catalog ul {
-
 	padding: 0;
-
 	list-style: none;
-
 }
 
 #leftbar_catalog .index-item,