Yes, look around the CSS themes in https://meta.discourse.org/tags/c/theme/61/theme-full for ones with background images and take a look at how they add opaqueness. Always good to draw on prior art. Eg Geometric, a dark theme for Discourse
Yes, look around the CSS themes in https://meta.discourse.org/tags/c/theme/61/theme-full for ones with background images and take a look at how they add opaqueness. Always good to draw on prior art. Eg Geometric, a dark theme for Discourse