I added a light theme to the site.

My personal preference is for dark themes, which is why the original theme for this site (and still the default) was dark. There are plenty of arguments about which is better, most of which are almost completely unbacked by data and boil down to aesthetic preference. So, if your aesthetic preference is for light color themes, now you can have one on my blog.

Ant that's… really all there is to say about it. It's close to 90% just a value inversion of the (default) dark theme. If you want to see what it looks like, the easiest way is probably to use your browser's dev tools. If you're seeing it and you don't want to (or you're not seeing it and you do), you can override the system setting in Firefox. If you want to override it for my site only, file a feature request with your browser or go looking for an addon. There's no way for sites to adjust the color scheme preference themselves without Javascript.