[nicoburns]

Jekyll (and other similar projects like Hugo) will let you do custom styles. You have to write your own theme, but this is just HTML+CSS with a bit of templating. Far larger projects I would recommend using a CSS framework such as inuit.css with SASS, but for smaller projects you can get away with plain CSS.

Your other option is to use something like Laravel or Rails or Express, and just do server-side rendering. A lot of people are still doing this, and it's still well supported.

The advantage of the static site generators is much better performance / lower resource usage, at the cost of flexibility.