flex-1 Tailwind CSS Class
Grow and shrink equally. The generated CSS output is flex: 1 1 0%. This page gives you the generated CSS output, a copy-paste example, and an interactive demo for search-friendly utility lookups.
flex-1 maps to flex: 1 1 0%. It belongs to the Flexbox category and was generated from Tailwind CSS v4.1.14 reference data.
Interactive Demo
Toggle the utility on and off, switch preview surfaces, and adjust the demo content to see how this class behaves.
This preview simulates the effect of flex-1 using structured data generated from your Tailwind reference snapshot.
Visual Comparison
flex-1 changes layout behavior through flex: 1 1 0%, so the element's relationship to nearby content becomes more deliberate.
Variants & Breakpoints
Use the base utility directly, then layer state or responsive variants when the component needs more specific behavior.
| Context | Class syntax | Why use it | Preview |
|---|---|---|---|
| Base | flex-1 | Apply flex-1 directly to the element. | Default application |
| sm | sm:flex-1 | Applies from 640px and up. | 640px |
| md | md:flex-1 | Applies from 768px and up. | 768px |
| lg | lg:flex-1 | Applies from 1024px and up. | 1024px |
Utility Family Comparison
Compare nearby options and related companions so you can choose the right intensity before reaching for trial-and-error tweaks.
When to use this class
Use it when structure matters more than styling, especially while shaping containers, flow, alignment, or item placement in responsive UI sections.
Watch out for
Layout utilities can have knock-on effects on siblings and wrappers, so test them in the real component instead of a single isolated element only.
Class Reference
| Field | Value |
|---|---|
| Utility class | flex-1 |
| Category | Flexbox |
| CSS output | flex: 1 1 0% |
| Source page | Cheat Sheet |
| Static slug | flex-1 |
Example Snippet
Use this code snippet as a starting point, then swap the markup around it to fit your component or layout.
<div class="flex flex-1 gap-4 rounded-lg border border-slate-200 p-4"><div>One</div><div>Two</div><div>Three</div></div>Related Utility Pages
Browse More
Return to the Cheat Sheet page for broader browsing, or open the Tailwind CSS Cheat Sheet to move across categories quickly.