remove useless css styles

pboard/pboard/templates/master.mak

         margin: 0 auto -60px;
       }
 
-      /* Set the fixed height of the footer here */
-      #push,
-      #footer {
-        height: 60px;
-      }
-      #footer {
-        background-color: #f5f5f5;
-      }
-
       /* Lastly, apply responsive CSS fixes as necessary */
       @media (max-width: 767px) {
         #footer {