no message

Former-commit-id: a5e423df21661bc84fc6d243560741f69220a468
Former-commit-id: 5e2576dd20d0a249e4bdbbf2fe244324dccc24d1
Former-commit-id: 9b402b0a67e43e11a4b551595ba24eca79f16b8d

src/assets/style/theme/default.scss

@@ -96,6 +96,13 @@ $color: #409EFF;
         .el-menu {
           background-color: $color-bg;
           border-right: none;
+          &.el-menu--collapse {
+            .el-submenu {
+              .el-menu {
+                background-color: #FFF;
+              }
+            }
+          }
           .el-menu-item {
             &:focus {
               background-color: $color-bg;