Tap the site preview!
Although Universe on the Web does not offer full editing capabilities (you'll need to download the app from the Apple App Store for this), you can still customize how your site appears on the internet before publishing it!
While building your site (on the add links screen) you can tap the site preview in the top to change the active theme!
You'll have several options to choose from here are examples of a few:
Looking to build your own theme? Download the Universe app from the App Store and dive into our Theme Engine.