I did this, and it did the job.
/* ================================================ */
/* how to highlight current page */
/* ================================================ */
ul.rMenu li.current_page_item a:active,
ul.rMenu li.current_page_item a:visited,
ul.rMenu li.current_page_item {
color: #ffffff !important;
background: #748daf;
background: -webkit-gradient(linear, 0 0, 0 bottom, from(#748daf), to(#5b6e88))!important;
background: -webkit-linear-gradient(#99BBEA, #4991C9);
background: -moz-linear-gradient(#99BBEA, #4991C9);
background: -ms-linear-gradient(#99BBEA, #4991C9);
background: -o-linear-gradient(#99BBEA, #4991C9);
background: linear-gradient(#99BBEA, #4991C9);
-ms-filter:"progid:DXImageTransform.Microsoft.linear-gradient(startColorstr=#99BBEA,endColorstr=#4991C9 )";
filter

rogid:DXImageTransform.Microsoft.linear-gradient(startColorstr=#99BBEA,endColorstr=#4991C9 );
}