[bugfix] Fix width of content row

With the old layout the ".wrapper .row{margin:0px;}" overwrites
the "margin:-15px" of bootstrap. However, in the modified layout
the .row is no longer contained in a .wrapper but in #main-content.

static/css/style.css

@@ -280,6 +280,10 @@ ul.sidebar-menu li.active a i {
 	width: 100%;
 }
 
+#main-content > .row {
+  margin: 0px;
+}
+
 a.logo {
     font-size: 22px;
     font-weight: 300;