New concepts
A reusable .section-container (max-width + centering + side padding), second-class composition on semantic elements, and full-bleed bands with constrained content.
What changes after Travel?
Earlier chapters set max-width as one-off declarations. This chapter turns that technique into a named layout primitive you reuse across a whole page.
Lessons
Checkpoint
Build a three-band page that uses one container class at least three times, keeps backgrounds full-bleed, and never invents a second max-width utility for the same document.