重构样式：删除不使用的.clearcache样式，移动下拉框菜单鼠标悬停样式到site.css文件中

Bootstrap.Admin/wwwroot/css/admin.css

@@ -1,9 +1,4 @@
-.dropdown-select + .dropdown-menu a:hover {
-    background: #007AC0;
-    color: #fff;
-}
-
-.logTs, .logSql, .logDbExcep {
+.logTs, .logSql, .logDbExcep {
     color: red;
     font-weight: 600;
 }
@@ -18,21 +13,6 @@
     font-weight: 600;
 }
 
-.clearcache {
-    position: absolute;
-    right: 60px;
-    color: #d9534f;
-    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .15), 0 1px 1px rgba(0, 0, 0, .075);
-}
-
-    .clearcache:hover, .clearcache:focus {
-        color: #c12e2a;
-    }
-
-    .clearcache:active:hover {
-        color: #ac2925;
-    }
-
 .main-content {
     transition: all .4s ease-in-out;
     padding: 15px 15px 0 15px;

Bootstrap.Admin/wwwroot/css/site.css

@@ -115,6 +115,11 @@ a, a:hover, a:focus {
     outline: none;
 }
 
+.dropdown-select + .dropdown-menu a:hover {
+    background: #007AC0;
+    color: #fff;
+}
+
 .dropdown-menu a {
     transition: all .25s linear;
     padding: 6px 20px;