diff --git a/Bootstrap.Admin/Views/Shared/Header.cshtml b/Bootstrap.Admin/Views/Shared/Header.cshtml
index c7760338..c5189ef9 100644
--- a/Bootstrap.Admin/Views/Shared/Header.cshtml
+++ b/Bootstrap.Admin/Views/Shared/Header.cshtml
@@ -84,6 +84,11 @@
                     </div>
                 </div>
                 <!-- db dropdown end -->
+                <div class="dropdown">
+                    <a class="shadow-success" href="~/Account/Lock" data-toggle="tooltip" title="系统锁屏">
+                        <i class="fa fa-tv"></i>
+                    </a>
+                </div>
             }
         </div>
         <div class="dropdown userinfo">
diff --git a/Bootstrap.Admin/wwwroot/css/lte.css b/Bootstrap.Admin/wwwroot/css/lte.css
index 26af58f0..7fa327b1 100644
--- a/Bootstrap.Admin/wwwroot/css/lte.css
+++ b/Bootstrap.Admin/wwwroot/css/lte.css
@@ -68,11 +68,11 @@
     border-radius: 0;
 }
 
-    .userinfo .dropdown-toggle, .userinfo .dropdown-toggle:hover, .userinfo.show .dropdown-toggle, .nav [data-toggle="dropdown"], .nav [data-toggle="dropdown"]:hover {
+    .userinfo .dropdown-toggle, .userinfo .dropdown-toggle:hover, .userinfo.show .dropdown-toggle, .header .nav a, .header .nav a:hover {
         border: none !important;
     }
 
-        .userinfo .shadow-default, .nav [data-toggle="dropdown"], .nav [data-toggle="dropdown"]:hover {
+        .userinfo .shadow-default, .header .nav a, .header .nav a:hover {
             box-shadow: none;
         }
 
@@ -211,11 +211,11 @@ aside .nav-brand {
     color: #b8c7ce;
 }
 
-.header, .header .breadcrumb-item a, aside .nav-brand a, .sidebar-toggle-box, .userinfo .dropdown-toggle, .nav [data-toggle="dropdown"], .userinfo .dropdown-item, .userinfo .dropdown-item a, .userinfo .dropdown-item:last-child a {
+.header, .header .breadcrumb-item a, aside .nav-brand a, .sidebar-toggle-box, .userinfo .dropdown-toggle, .header .nav a, .userinfo .dropdown-item, .userinfo .dropdown-item a, .userinfo .dropdown-item:last-child a {
     color: #eee;
 }
 
-    .sidebar-toggle-box:hover, aside .nav-brand a:hover, .userinfo .dropdown-toggle:hover, .userinfo.show .dropdown-toggle, .nav [data-toggle="dropdown"]:hover, .sidebar .nav-link:hover, .userinfo .dropdown-item:hover, .userinfo .dropdown-item a:hover, .userinfo .dropdown-item:last-child a:hover {
+    .sidebar-toggle-box:hover, aside .nav-brand a:hover, .userinfo .dropdown-toggle:hover, .userinfo.show .dropdown-toggle, .header .nav a:hover, .sidebar .nav-link:hover, .userinfo .dropdown-item:hover, .userinfo .dropdown-item a:hover, .userinfo .dropdown-item:last-child a:hover {
         color: #fff;
     }
 
diff --git a/Bootstrap.Admin/wwwroot/css/theme.css b/Bootstrap.Admin/wwwroot/css/theme.css
index 0a1db5e7..47df978f 100644
--- a/Bootstrap.Admin/wwwroot/css/theme.css
+++ b/Bootstrap.Admin/wwwroot/css/theme.css
@@ -90,7 +90,7 @@ aside .bg, aside .nav-brand, aside .nav-header, .header .nav, .userinfo .dropdow
     transition: all .25s linear;
 }
 
-.userinfo .dropdown-toggle, .nav [data-toggle="dropdown"] {
+.userinfo .dropdown-toggle, .header .nav a {
     border: 1px solid #eee;
     color: #777;
 }
@@ -159,7 +159,7 @@ aside .bg, aside .nav-brand, aside .nav-header, .header .nav, .userinfo .dropdow
     top: 6px;
 }
 
-.nav [data-toggle="dropdown"] {
+.header .nav a {
     border-radius: 4px;
     padding: 6px 12px;
     transition: all .25s linear;