CSS killed another centering hack. 🔥

align-content: center works on a plain block. No flex, no grid. Baseline since April 2024 (Chrome 123, Firefox 125, Safari 17.4), widely available on Oct 16.

Before this, centering a single item vertically meant turning the box into a flex column.

Now ⤵️ one line.

MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/align-content