Revert to 5px padding on edges

On mobile this gives the text a little extra padding from the sides of the screen. This is safe to do now that we use the right box sizing.

examples/misc_controls_trackball.html

@@ -26,7 +26,7 @@
 				color:#000;
 				position: absolute;
 				top: 0px; width: 100%;
-				padding: 5px 0;
+				padding: 5px;
 				box-sizing: border-box;
 			}