Product Landing Page Test

Can someone help me understand why my Landing page will not pass two of the tests (questions 5 and 13; I know the issue with my other test failure)? I have provided the link below. Thanks in advance.

#5 “Each .nav-link element should have an href attribute” Make sure the Anchors (<a>) have the .nav-link class

#13 " The navbar should always be at the top of the viewport." When you scroll down, the nav bar should be fixed at the top of the page (link on this page with the green banner at top)

Thank you very much!