Create Amazing Card Zigzag Border Animation in CSS

project demo

html code

				
					<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Animated Zigzag Border</title>
    
</head>

<body>

    <div class="card">
        <h2>Border Animation</h2>
        <p>The Dark CSS zigzag border is rotating around the box using CSS animation.</p>
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</html>

css code

				
					@import url('https://fonts.googleapis.com/css2?family=Anton&family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

body {
    background: #0f172a;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Poppins", sans-serif;
}

.card {
    position: relative;
    width: 320px;
    overflow: hidden;
    z-index: 1;
    padding: 30px;
    background: #1e293b;
    color: #fff;
    border-radius: 12px;
    text-align: center;
}

.card::before {
    content: "";
    position: absolute;
    inset: 0;
    padding: 6px;
    background:
        repeating-linear-gradient(45deg, #eaea33 0 6px, transparent 6px 12px),
        repeating-linear-gradient(-45deg, #eaea33 0 6px, transparent 6px 12px);
    mask:
        linear-gradient(#000 0 0) content-box,
        linear-gradient(#000 0 0);
    mask-composite: exclude;
    border-radius: 12px;
    z-index: -1;
    background-size: 30px 30px;
    animation: moveZigzag 3s linear infinite;
}

.card h2 {
    font-weight: 600;
    margin-bottom: 10px;
    font-size: 1.5rem;
    color: #eaea33;
    letter-spacing: 1.3px;
}

.card p {
    font-size: 0.95rem;
    color: #e2e8f0;
}

@keyframes moveZigzag {
    0% {
        background-position: 0 0, 0 0;
    }

    100% {
        background-position: 60px 60px, -60px -60px;
    }
}