So Now I wanted to add bottom-border to my <a> tag.

    <li><a href="/ContactUs.aspx" class="acontact">Contact us</a></li>

  $(function() {

            $('a.acontact').click(function() {
                        $(this).css('border-bottom', '3px solid navy');

            });
           
            });

I am seeing the border but it is not staying. Can anyone help me what should I do?

Thanks,
priya