refactor: 更新样式

Author: ArgoZhang

src/components/BootstrapBlazor.Region/Components/SelectRegion.razor.css

@@ -71,12 +71,12 @@
         color: #777;
     }
 
-        .bb-region-body ul li.active {
-            background-color: #e3e3e3;
+        .bb-region-body ul li:hover {
+            background-color: #e9ecef;
             color: #000;
         }
 
-        .bb-region-body ul li:hover {
+        .bb-region-body ul li.active {
             background-color: #e3e3e3;
             color: #000;
         }