JAVASCRIPT

active-class router-link

//when a route is active we can use this to add a certain style to the element:
<router-link to="/[route-name]" active-link="active'> <router-link>

//when the route is active, active-link will add the class active to the element
//you can define then a certain style for elements that contain the class active

active link

#top-menu .current a
{
    color: orange !important;
}