in the screen.css file, add overflow: hidden; to the #outerWrapper #contentWrapper #content selector:
#outerWrapper #contentWrapper #content {
margin: 0 0 0 176px; /* Sets the margin properties for an element using shorthand notation (top, right, bottom, left) */
padding: 10px 10px 10px 10px; /* Sets the padding properties for an element using shorthand notation (top, right, bottom, left) */
overflow: hidden;
}