Using JavaScript to Make my own Webcomic Page

For about a month, I’ve been running a webcomic hosted over on comicfury, and It’s been working out fairly well. But I don’t like the way the webpage looks… Is there any way to use the inspect element to change the way the webpage looks without completely breaking the site? Or should I make a new site and start fresh?

Making changes through inspect page would only result in local changes on your computer, the changes you make won’t reflect anywhere else.