CSS corner-bottom-left-shape Property - Playground Example

<!DOCTYPE html><html><head><style type="text/css">* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, #f0f4ff 0%, #eef6ff 100%);
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: #0b1a2b;
}

.wrap {
    padding: 40px;
}

.card {
    width: 360px;
    padding: 28px 24px;
    background: linear-gradient(135deg, #5b6cff 0%, #9b7bff 100%);
    color: #fff;
    box-shadow: 0 8px 30px rgba(84, 98, 255, 0.18);
    border-radius: 40px;
    corner-bottom-left-shape: bevel;
    /* make sure text doesn't get clipped too close to the edges */
    overflow: hidden;
}

.card h2 {
    margin: 0 0 8px 0;
    font-size: 1.25rem;
    line-height: 1.1;
}

.card p {
    margin: 0;
    font-size: 0.95rem;
    opacity: 0.95;
}

/* responsive tweak: make the cut smaller on narrow screens */
@media (max-width: 420px) {
    :root { --corner-bottom-left-shape: polygon(0 0, 100% 0, 100% 100%, 18% 100%, 0 18%); }
    .card { width: 300px; }
}
</style></head><body><div class='wrap'>
    <div class='card'>
        <h2>Corner Bottom-Left Shape</h2>
        <p>This card uses a custom property and clip-path to cut the bottom-left corner.</p>
    </div>
</div></body></html>