SiderBar V1.3

src/styles/sidebar.scss

@@ -75,7 +75,9 @@
     // menu hover
     .submenu-title-noDropdown,
     .el-submenu__title {
-      &:hover {
+
+      &:hover,
+      &.is-active {
         background-color: $menuHover !important;
       }
     }