in the screen.css file, remove the overflow: auto; atribute from the html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6 selector:
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6 {
margin: 0;
padding: 10, 10, 0, 10;
border: 0;
outline: 0;
font-size: 100%;
/*overflow: auto;*/
}