The big mistake Using Tailwind CSS for Notado is the single biggest mistake I have ever made in my career as a developer. I cannot overstate the amount of technical debt that this has introduced, and how it has compounded over the years since this decision was taken. Never use this for a one-man SaaS project. One of the biggest consequences of this mistake was that introducing dark mode immediately became a non-trivial task, especially when compared to Kullish, where I had the good sense to use Bulma, and adding dark mode was the simple case of adding a single link element to my existing base HTML template: