Easy to implement light and dark themes with light-dark() css function

With dread in my heart, I connected to the world wide web. I wanted to learn how to code the switch between light and dark themes for this blog, expecting some messy javascript hacks to load either one css file or another. To my pleasant surprise, I found a relatively new function that solves this exact problem: light-dark(). It essentially accepts two arguments: a color for the light theme and a color for the dark theme. Since the browser knows what the user wants, it picks the suitable color. That's it!