fixed #258

IE10 (as part of its browser defatuls style) adds in its own padding to
input boxes, which casued the content
to get pushsed down

src/backgrid.css

@@ -103,7 +103,7 @@
   display: block;
   width: 100%;
   height: 100%;
-  padding: 4px 5px;
+  padding: 0 5px;
   margin: 0;
   background-color: transparent;
   border: 0;