Overall border-image is a mess, and most authors won't touch it with a bargepole unless they really have to (per the 2022 Almanac it is used on < 7% of pages, which seems way lower than the frequency ...
Now, it's time to practice your understanding of the CSS: Colors, Borders, and Shadows. Remember to save the CSS file and refresh the page in the browser whenever you make changes. You will begin with ...