Giving more style to the front end manage UI to keep it from being affected by Theme CSS

First of many additions, most likely

--HG--
branch : dev

src/Orchard.Web/Core/Themes/Styles/special.css

@@ -14,6 +14,7 @@
     border-top:0;
     border-right:0;
     display:none;
+    margin:0;
     overflow:hidden;
     position:absolute;
     right:0;