CSS Validator | Test & Check CSS Code
Check your CSS for common syntax mistakes and invalid rules. Paste your stylesheet into the validator and find areas that may need a closer look.
About CSS Validator
CSS can be frustrating when one small mistake makes a style stop working. The tricky part is that the problem isn't always obvious, especially when you're dealing with a long stylesheet.
A CSS Validator gives you a quick way to check what's going on. Paste your code into the tool and look through the results for syntax mistakes or rules that may need fixing.
It's useful when a new style isn't behaving properly, when you've copied code from somewhere else, or when you're cleaning up an older project. It can also help beginners understand what valid CSS looks like as they practice.
Before spending too much time searching for a stubborn problem, running the stylesheet through a validator is often a good first step.