you can take out this code from the above ul.nav li.li.curre-t-menu-item a it has no relevance to the css
Hi i have managed to solve this issue with this code
ul.nav li.current-page-item a,
ul.nav li.current-page-parent a,
ul.nav li.current-page-ancestor a,
ul.nav li.li.curre-t-menu-item a
{
border-style: solid !important;
border-width: 2px !important;
border-color: #ffffff !important;
}
Thanks
