Mastodon usually has a dark theme by default, but you can switch to a light theme or high contrast theme if you prefer.
Go to Preferences > Appearance > Site Theme, choose the one you want and click "Save Changes".
Some instances have additional themes too. Ask your admin if you want more themes added.
QOTO: Question Others to Teach Ourselves. A STEM-oriented instance.
An inclusive free speech instance.
All cultures and opinions welcome.
Explicit hate speech and harassment strictly forbidden.
We federate with all servers: we don't block any servers.