These are a set of 7 main CSS classes that can be used to apply individual color schemes to daily notes for each day of the week. These as well as the included template can be used with the Templater plugin to create some automatically-themed daily notes inside your Obsidian vault!
The template references your note's filename to get the date and expects a "YYYYMMDD" naming format! If you don't wish to use this format, you could either customize the template using Moment.js formatting, or grab the old version of the template that doesn't rely on the filename, but can only reference the current date here.
To customize the colors for each day, just swamp out the colors values under the main "day of the week" classes.
NOTE: By default, this snippet relies on the Bai Jamjuree or JetBrainsMono Nerd Font Mono fonts. If you don't wish to use these, then just change or remove those font-family lines from the snippet.