active link to posts in pages Wordpress

active link to posts in pages Wordpress

I have been reading around about how to make the navigation link stay
active, when inside a post[ single page ]. I haven't found any solutions
so i created a mix of jquery and php, But i don't think this is the right
way dough it work.
So I was thinking of how to optimize the code much more. Any ides ?
<?php
if (in_category('news')){ ?>
<script>
$(".menu-item-46 a").css("border-bottom","#000 5px solid");
$(".menu-item-46 a").css("padding-bottom","11px");
</script>
<?php }elseif (in_category('network')){ ?>
<script>
$(".menu-item-47 a").css("border-bottom","#000 5px solid");
$(".menu-item-47 a").css("padding-bottom","11px");
</script>
<?php } ?>