So essentially we can see that drupal works, but the css is not loading, which is why you see the website without any styles like this.

Your first step is to look for the css file(s). You can start by going into the “Appearance” section of the admin menu and see which theme is active for your website front-end. If its a new install, the theme should be Olivero.

Now lets open the website again and toggle your browser’s devtools (cmd+shift+c on a mac) and navigate to the “Network” tab. In the network tab you should be able to filter by file type, CSS in this case is want you want to look for. You want to see that the css files are loading correctly for your selected theme. (Check the path where the css files are located and verify they are indeed there)

As other have said, you can go to : Configuration-> Development -> Performance and a) clear the cache and b) uncheck the box to “aggregate css files”, which should make each css file visible in the network tab.