diff --git a/static/public/css/theme.css b/static/public/css/theme.css
index 7981abf..e17cf0d 100644
--- a/static/public/css/theme.css
+++ b/static/public/css/theme.css
@@ -247,6 +247,9 @@ button[type="button"], input[type="button"] { background: var(--accent-soft); co
 .minimap:empty { display: none; }
 .minimap .tag {
     display: inline-block;
+    max-width: 140px;
+    overflow: hidden;
+    text-overflow: ellipsis;
     padding: 0.25rem 0.6rem;
     font-size: 0.78rem;
     font-weight: 500;
@@ -258,11 +261,24 @@ button[type="button"], input[type="button"] { background: var(--accent-soft); co
     white-space: nowrap;
     transition: color 0.15s, background 0.15s, border-color 0.15s;
 }
+.minimap::-webkit-scrollbar { width: 4px; }
+.minimap::-webkit-scrollbar-track { background: transparent; }
+.minimap::-webkit-scrollbar-thumb {
+    background: var(--border);
+    border-radius: 4px;
+}
+.minimap::-webkit-scrollbar-thumb:hover { background: var(--muted); }
 .minimap .tag:hover {
     color: var(--accent-dark);
     background: var(--accent-soft);
     border-color: var(--accent);
 }
+.minimap .tag.back {
+    color: var(--accent);
+    background: var(--accent-soft);
+    border-color: var(--accent);
+    margin-bottom: 0.25rem;
+}
 
 /* ===== Node Form (dnfs) ===== */
 .node-form { margin-top: 1rem; }
diff --git a/static/public/js/dnfs.js b/static/public/js/dnfs.js
index 56f5311..83248cd 100644
--- a/static/public/js/dnfs.js
+++ b/static/public/js/dnfs.js
@@ -224,20 +224,6 @@ function load_notes(main_node) {
 
 
 	recommend_list.replaceChildren();
-	//alert(stack.length)
-	if (stack.length > 0) {	/* 如果不在根节点 */
-		var bak = document.createElement('center');
-		bak.addEventListener('click', function (event) {
-			stack.pop();
-			var id = (stack.length > 1) ? stack[stack.length - 1] : 0;
-			getNode(token, id).then(load_notes)
-			getNode(token, id).then(loadMap)
-		});
-		var bak1 = document.createElement('h1');
-		bak1.textContent = "返回上一层";
-		bak.appendChild(bak1)
-		recommend_list.appendChild(bak)
-	}
 	for (let i in main_node) {
 		let item = main_node[i]
 		let card = document.createElement('div');
@@ -273,6 +259,18 @@ function load_notes(main_node) {
 
 function loadMap(children_json) {
     minimap.replaceChildren();
+    if (stack.length > 0) {
+        let back = document.createElement("div");
+        back.className = "tag back";
+        back.textContent = "← 返回上一层";
+        back.addEventListener("click", () => {
+            stack.pop();
+            var id = (stack.length > 0) ? stack[stack.length - 1] : 0;
+            getNode(token, id).then(load_notes);
+            getNode(token, id).then(loadMap);
+        });
+        minimap.appendChild(back);
+    }
     for (let i in children_json) {
         let item = children_json[i];
         let tag = document.createElement("div");