I haven't messed with it, but keithcurtis has a couple threads dealing with using the browser addon Stylus.  It will only change how it renders on your view, but a post on that can be found here (with stuff about Stylus in the top post of the thread):   <a href="https://app.roll20.net/forum/post/7209333/show-off-your-style/?pageforid=7455586#post-7455586" rel="nofollow">https://app.roll20.net/forum/post/7209333/show-off-your-style/?pageforid=7455586#post-7455586</a>   If you are using a custom sheet, or are willing to mess with the roll template code for your sheet, I posted something about that a while back.  That can be found here:   <a href="https://app.roll20.net/forum/post/7383017/chat-menues-and-the-big-pink-button/?pageforid=7383017#post-7383017" rel="nofollow">https://app.roll20.net/forum/post/7383017/chat-menues-and-the-big-pink-button/?pageforid=7383017#post-7383017</a>   Hopefully one of those 2 will be of use.