This h1 by default is colored black but the external stylsheet css makes it blue

This h2 is designated blue by the css but the styling in the head tag overrides it making it red.

This h3 is designated red by the head but the inline styling overrides it making it green.

This h4 is designated blue by main.css but secondary.css overrides it making it orange.

Let's look at main.css
Let's look at secondary.css