CSS utility classes are AMAZING. They save incredible amounts of time when both building and maintaining frontend code - ESPECIALLY in React/Vue/etc JS frameworks. Tailwind is a great CSS utility class framework that makes CSS fun again.
Tailwind.css provides you with thousands of utility classes for nearly anything you would normally write CSS for in your HTML, CSS, & Javascript web development. These classes allow you to write style right in the markup and never have to worry about managing stylesheets.
Utility classes really shine when you use them in javascript frameworks like React.js, Vue.js, etc. It allows you to copy/paste your component HTML and move it around freely with CSS always "just working".
