body { font-family: 'Segoe UI', sans-serif; background: #f0f4f8; display: flex; justify-content: center; align-items: center; min-height: 100vh; margin: 0; color: #333; } .card { background: white; border-radius: 12px; box-shadow: 0 10px 25px rgba(0,0,0,0.1); max-width: 500px; width: 100%; overflow: hidden; } .header { background: linear-gradient(135deg, #1e3a5f, #2563eb); color: white; padding: 24px; } h1 { margin: 0; font-size: 24px; } .badge { background: rgba(255,255,255,0.2); padding: 4px 10px; border-radius: 20px; font-size: 12px; float: right; } .content { padding: 24px; } ul { line-height: 1.8; color: #555; } .btn { background: #2563eb; color: white; border: none; padding: 10px 20px; border-radius: 6px; cursor: pointer; font-size: 16px; width: 100%; margin-top: 20px; } .btn:hover { background: #1d4ed8; } #output { margin-top: 16px; text-align: center; color: #2563eb; font-weight: 500; }

Write HTML in the first tab, style it with CSS in the second, add JS in the third.

Edit any tab and click Run
Open in New Tab for full view
Export to download as .html

Hosted & Compiled with HtmlRunner.com

Welcome to HTMLRunner