Try https://b.piefed.social/ instead! Log in with the same username and password as piefed.social.

It works best on a phone / tablet but on a desktop it's fine too once you switch to compact mode.

It can be installed as a PWA.

There are also lots of themes you can try at https://piefed.social/user/settings. Here are some screenshots of them - https://join.piefed.social/screenshots/