I have added a button images to the page menu for each page. The writing is appearing above the image instead of on it. How do I get it to write on top of the buttons.

ul.rMenu li a {
width: 99px !important;
height: 50px !important;
text-align: bottom center !important;
background-image: url("/wp-content/themes/atahualpa/images/round_header_purple.jpg") !important;
padding-left: 20px !important;
}

I would have to see an URL of this