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src/layout/index.scss

@@ -34,6 +34,20 @@
                 opacity: .8;
             }
         }
+        .header-top-collapse-bar {
+            position: relative;
+            height: 100%;
+            font-size: 20px;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            padding: 0 10px;
+            cursor: pointer;
+            transition: opacity .2s;
+            &:hover {
+                opacity: 0.7;
+            }
+        }
         .header-top-menu-bar {
             position: relative;
             padding: 0 4px;