a, img{border: 0px;}

in to the box. To remove ALL underlines add

a:link {text-decoration:none;}

on a new line

These add other effects

a:visited {color: #000000;text-decoration:none;}
a:hover {color: #f433b1;text-decoration:underline;}
a:active {color: #FF6C00;text-decoration:none;}