From www.domain.com to localhost

Hi all, I have a private server running my WordPress site. That server was behind https://www.domain.com I quit the domain, with the idea that I could use the WordPress site still on my server. But I can’t reach the website anymore, because when I try to reach it at 192.168.1.1 but the login screen tries to connect to https://www.domain.com/wp-login.php which is impossible, because https://www.domain.com doesn’t excist anymore.
When I go to 192.168.1.1 or to localhost I get the content, without the css loaded. Is there any chance to fix this? I’ve been running trough the config file, but couldn’t find a clue. Thank you in advance,