Basic theme layout fix.

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Themes/Basic/Layouts/Account.cshtml

@@ -24,7 +24,7 @@
 
     @RenderSection("styles", false)
 </head>
-<body>
+<body class="abp-account-layout">
 
     @(await Component.InvokeAsync<MainNavbarViewComponent>())
 

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Themes/Basic/Layouts/Application.cshtml

@@ -24,7 +24,7 @@
 
     @RenderSection("styles", false)
 </head>
-<body>
+<body class="abp-application-layout">
 
     @(await Component.InvokeAsync<MainNavbarViewComponent>())
 

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Themes/Basic/Layouts/Empty.cshtml

@@ -22,7 +22,7 @@
 
     @RenderSection("styles", false)
 </head>
-<body>
+<body class="abp-empty-layout">
 
     <div class="container">
         @(await Component.InvokeAsync<PageAlertsViewComponent>())

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/wwwroot/themes/basic/layout.css

@@ -1,8 +1,12 @@
 body {
-  padding-top: 5rem;
+    padding-top: 5rem;
 }
 
+    body.abp-empty-layout {
+        padding-top: 0;
+    }
+
 #main-navbar-tools a.dropdown-toggle {
     text-decoration: none;
     color: #fff;
-}
+}