Your h2 element should be blue. Error

code is correct and will not let me proceed, what should I do?

Are you using any type of browser extension that affects the colors on the page, such as a dark mode extension? If so then that is probably keeping the tests from working properly. There is a note about this on the landing page:

“Note: Some browser extensions, such as ad-blockers and dark mode extensions can interfere with the tests. If you face issues, we recommend disabling extensions that modify the content or layout of pages, while taking the course.”