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HTML
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<div class="card"> <h1>Hello!</h1> <p>Edit the HTML, CSS, and JS then press Run.</p> <button id="hello-btn">Click me</button> </div>
CSS
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body { font-family: sans-serif; background: #0f1724; color: #e6eef6; padding: 24px; } .card { background: #111c2e; border-radius: 16px; padding: 24px; max-width: 420px; box-shadow: 0 12px 30px rgba(2, 6, 23, 0.25); } button { margin-top: 12px; padding: 10px 16px; border-radius: 999px; border: 0; background: #7722ff; color: white; font-weight: 600; cursor: pointer; }
JavaScript
Format
const button = document.getElementById("hello-btn"); button.addEventListener("click", () => { console.log("Hello!"); });
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