Page scrolls sideways at 320px wide

Why it matters

People who zoom to 400% on a desktop get the equivalent of a 320px-wide screen. If the page scrolls in two directions, reading is a chore.

Find the element that is wider than the screen (often a fixed width, table, image or code block) and let it shrink or scroll on its own.

img, video, iframe { max-width: 100%; height: auto; }
pre, table { overflow-x: auto; }

Find this on your own site. A11yMate scans every page and lists where it happens. See pricing or browse all rules.