修改样式：更新网站设置页面皮肤样式下拉框控件为按钮组

Bootstrap.Admin/Views/Admin/Settings.cshtml

@@ -45,9 +45,9 @@
 <div class="card">
     <div class="card-header">网站样式</div>
     <div class="card-body">
-        <form id="CssDataForm" class="form-inline">
-            <div class="form-group">
-                <div class="dropdown">
+        <div class="form-group text-right">
+            <div class="btn-group" role="group">
+                <div class="btn-group" role="group">
                     <button id="dictCssDefine" class="btn btn-success dropdown-select dropdown-toggle" data-toggle="dropdown" data-default-val="" value="@Model.Theme">默认样式</button>
                     <ul class="dropdown-menu" role="menu" id="cssContainer">
                         <li><a href="#" data-val="">默认样式</a></li>
@@ -67,7 +67,7 @@
                 </div>
                 <button class="btn btn-secondary" type="button" data-method="css">保存</button>
             </div>
-        </form>
+        </div>
     </div>
 </div>
 <div class="card">