layouts

The complete guide to centering a div in CSS in 2026 — covering all 5 production techniques with live interactive demos. <strong>Flexbox</strong> (the modern default, works for 95% of cases): <code>display: flex; align-items: center; justify-content: center</code> on the parent. <strong>CSS Grid</strong> (one-line shorthand): <code>display: grid; place-items: center</code>. <strong>Absolute positioning + transform</strong> (for overlays and modals): <code>position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%)</code>. <strong>Margin auto</strong> (for block elements with a known width): <code>margin: 0 auto</code> (horizontal only) or <code>margin: auto</code> with <code>position: absolute</code> + <code>inset: 0</code> (both axes). <strong>All methods side-by-side comparison</strong> — see every technique render the same content with visible axis crosshairs so you can see exactly where each method lands the element. All 5 demos are 100% pure CSS, MIT-licensed, copy-paste ready, with detailed explanations of which method to use when. Works in every modern browser (Chrome, Safari, Firefox, Edge), no JavaScript required.

10 hand-coded CSS feature section templates covering the patterns landing pages actually need in 2026 — icon grid with stats strip, Apple-style bento grid layout, dark glassmorphism with animated blobs, scroll-reveal alternating rows, developer SDK with syntax-highlighted code preview, side-by-side comparison table with pricing cards, full SaaS hero with mesh-gradient + social proof, 3D mousemove tilt cards, parchment-cream floating phone mockup, and Linear-style product roadmap timeline. 7 of 10 demos are 100% pure CSS — drop into any stack. The 3 JS-enhanced demos (scroll-reveal, 3D tilt, timeline-glow) degrade gracefully if JavaScript is disabled. Every demo respects prefers-reduced-motion, uses scoped .fsNN__* class names so multiple can coexist, and ships MIT-licensed.

11 hand-coded CSS header designs covering the patterns search demand actually targets — pure-CSS sticky header that solidifies on scroll using scroll-timeline (no JavaScript, no scroll listener, zero impact on Core Web Vitals), CSS Grid mega menu with :focus-within keyboard accessibility, performance-first flexbox 3-column navbar, full-screen overlay hamburger header via checkbox hack, glassmorphism transparent bar with backdrop-filter, sticky announcement bar with grid-template-rows dismiss animation, two-tier double-decker enterprise header, animated link hover effects (scaleX underline, clip-up fill, gradient sweep, dual-layer swap, bracket reveal), vertical sidebar navigation with persistent rail, three-level multi-level dropdown menu via :focus-within, and a shrinking header on scroll using animation-timeline. 10 truly pure-CSS, 1 with a tiny optional vanilla JS snippet. WCAG-aware, prefers-reduced-motion respected, scoped class names that never collide with your existing styles, MIT-licensed.