Fix z-index in section

src/stylesheets/Lungo.layout.less

@@ -69,9 +69,7 @@ header, footer  {
     left: 0;
     width: 100%;
     display: block;
-    z-index: 1;
-
-    overflow: hidden;
+    z-index: 2;
 }
 
 header {

src/stylesheets/css/Lungo.layout.css

@@ -127,8 +127,7 @@ footer {
   left: 0;
   width: 100%;
   display: block;
-  z-index: 1;
-  overflow: hidden;
+  z-index: 2;
 }
 header {
   top: 0;