Documents responsive design utilities in Tailwind CSS v4: the default breakpoint scale (`sm`/`md`/`lg`/`xl`/`2xl`), defining custom breakpoints via `@theme`, container queries (`@container`, `@md`, `@lg` container-relative variants), and the mobile-first authoring pattern (base styles first, larger-breakpoint overrides layered on top).
Responsive Design
Default Breakpoints
| Variant |
Size |
CSS |
sm: |
40rem (640px) |
@media (width >= 40rem) |
md: |
48rem (768px) |
@media (width >= 48rem) |
lg: |
64rem (1024px) |
@media (width >= 64rem) |
xl: |
80rem (1280px) |
@media (width >= 80rem) |
2xl: |
96rem (1536px) |
@media (width >= 96rem) |
Custom breakpoint
@theme {
--breakpoint-3xl: 120rem;
}
/* Usage: 3xl:grid-cols-6 */
Container Queries v4
<div class="@container">
<div class="@md:grid-cols-2 @lg:grid-cols-3">
<!-- Responsive to container -->
</div>
</div>
Mobile-first
<div class="text-sm md:text-base lg:text-lg">
<!-- Small screens first -->
</div>
