CSS Flexbox vs Grid: Complete Guide 2026 — When to Use Which

CSS Flexbox and Grid are the two most powerful layout systems in modern CSS. But most developers don't fully understand when to use which — and end up overusing Grid for everything or using Flexbox for two-dimensional layouts. This guide gives you the decision framework you need. The Core Difference Flexbox Grid **Dimension** 1D (row OR column) 2D (rows AND columns) **Control** Content-driven Layout-driven **Best for** Components, navigation Page layouts, dashboards **Browser Support** 98%+ 98%+ When to Use Flexbox 1. Navigation Bars .nav { display : flex ; justify-content : space-between ; align-items : center ; } 2. Card Components .card-container { display : flex ; gap : 16px ; flex-wrap : wrap ; } 3. Centering Content .center-me { display : flex ; justify-content : center ; align-items : center ; } When to Use CSS Grid 1. Page Layouts .page-layout { display : grid ; grid-template-columns : 250px 1 fr 200px ; grid-template-rows : auto 1 fr auto ; grid-template-areas : "header header