#site_statistics div.xAxis div.tickLabel 
{    
  transform: rotate(-45deg);
  -ms-transform:rotate(-45deg); /* IE 9 */
  -moz-transform:rotate(-45deg); /* Firefox */
  -webkit-transform:rotate(-45deg); /* Safari and Chrome */
  -o-transform:rotate(-45deg); /* Opera */
  /*rotation-point:50% 50%;*/ /* CSS3 */
  /*rotation:270deg;*/ /* CSS3 */
}