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CSS Battle & CSS Challenges

Train your CSS with 105 progressive challenges: reproduce the target shape in code, compare pixels with the diff slider, and reach 100% precision.

Solved Challenges 0 / 105

Best Match 0%

#1 Quadrato Centrale ★☆☆☆

Colors:

HTML & CSS 0 car • 0 byte

⚡ Snippet:

💡 Shortcuts: Ctrl+Enter / Cmd+Enter to evaluate • Tab to indent

400×300

Waiting for evaluation...

Edit code and click "Evaluate Result" to calculate match percentage.

🎯 Target Goal

💻 Your Output

What is CSS Battle and How to Train Frontend Skills

CSS Battle is a hands-on training arena for web developers and designers. The goal is to reproduce a target graphic shape using only HTML and CSS, aiming for maximum pixel-perfect visual fidelity.

With 105 challenges sorted by complexity, you can master core properties like Flexbox, CSS Grid, asymmetric border-radius, polygonal clip-paths, conic and linear gradients, 3D transforms, and multi-layer box-shadows.

How Pixel-by-Pixel Evaluation Works

The comparison engine renders output onto a standard 400x300 pixel canvas and computes the normalized color distance between every pixel of your composition and the target image.

Use the Diff Slider (split view), Onion Skin transparency, and neon Diff Heatmap to immediately spot coordinate offsets, incorrect borders, or colors to tweak.