Nota hay una mejor solución para no duplicar tanto las variables de css y las clases. Que es controlando desde JS. Lo vemos en el proximo branch. Se elimina la clase .lightmode y se saca el @media ...

One way to add a background photo to any custom Tumblr theme is to embed a simple CSS tag at the right location in the theme's HTML code. Navigate to Tumblr and log in to your account.

A light and dark theme portfolio in HTML, CSS and JS. Support for video tutorial.. In this video I show you how to build a Portfolio that has a light and dark mode option and deploy it!