Thank you so much tuanphan! This has been extremely helpful! Can you please help me with a little hiccup? I'm using Maple template which belongs to the Brine family. I added this code based on your knowledge to have a little outline on the active page:
outline-style: solid !important;
outline-width: 1px !important;
outline-offset: 3px !important;
It works like a charm, but only on pages in the header. Links and Folders seem to have a different coding since it isn't working. Would appreciate your help a lot!