@shashgo, to fix your issue. codepen provides you with validators for HTML, CSS and JS. Click on the arrow in the upper right and then click on the corresponding ‘Analyze’ link. So for HTML, you’ll see you have a few issues that you need to resolve. The one that is causing you to fail the one test is having two of the same id’s.
As an aside, try not to use the <br> element. Instead, use CSS for your styling