Where do I put this?

nav a {
  color: #5a5a5a;
  font-size: 11px;
  font-weight: bold;
  padding-bottom: 14px;
  padding-left: 10px;
  padding-right: 10px;
  padding-top: 14px;
  text-transform: uppercase;


if you're in course usually in the css stylesheet tab, you can also put it between head element if you're NOT in codecademy courses


@obin100 is correct, and in this course we are using main.css for all or our CSS code.

This might help: