The default theme for WordPress
Twenty Twenty-One is a blank canvas that you can personalize with your content, using blocks and block patterns.
This website is an unofficial demo site, using the development version of the theme.
You can use it to help the developers test the theme, without having to set up your own installation.
Or just as a sneak peak of what is to come.
If you find styles or blocks that does not look correct on your device, browser or screen size, you can open an issue on the Github repository. But first, make sure that the problem is not already reported.
Try the customizer options
In the bottom right corner of the website, you will see a button that says “Customize Styles”. Click this button if you want to try the customizer settings yourself.
You will not be able to upload images or save anything, but you can test most of the options.