CSS Math Functions
Min, max, clamp, and calc express relationships inside a value. Clamp sets a lower limit, a preferred value, and an upper limit.
How it works
- Inspect the computed value as well as the declaration. Relative lengths, inheritance, and the cascade may make the final result different from a first guess.
- Prefer a small, predictable rule set. Fix the reason a declaration loses before adding more selectors or importance flags.
A practical example
The HTML supplies the content; the CSS below styles it. Open both together in the playground, then change the lesson rules at the end of the stylesheet.
<article class="card"><span class="badge">This Saturday</span><h2>Neighbourhood repair club</h2><p>Bring a small project. Share a useful skill.</p><a href="#booking">View the workshop</a></article>
body { margin: 0; padding: 24px; font-family: system-ui, sans-serif; color: #25332d; background: #f4f7f2; }
.card { padding: 20px; background: white; border: 1px solid #d4dfd6; }
h2 { margin-top: 0; }
p { line-height: 1.6; }
a { color: #17634c; }
.badge { display: inline-block; margin-bottom: 12px; font-size: .8rem; }
.layout { display: grid; gap: 16px; }
.photo { width: 100%; height: 160px; background: linear-gradient(135deg, #e4af6b, #668cba); }
button, input, select { font: inherit; padding: 8px; }
label { display: block; margin-block: 12px 4px; }
/* This lesson */
.card { padding: clamp(16px, 4vw, 36px); width: min(100%, 42rem); box-sizing: border-box; }
Min, max, clamp, and calc express relationships inside a value. Clamp sets a lower limit, a preferred value, and an upper limit.