CSS corner-shape Property - Playground Example

<!DOCTYPE html><html><head><style type="text/css">:root {
    --size: 180px;
}

* {
    box-sizing: border-box;
}

.wrap {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    padding: 28px;
    background: #f6f8fb;
    min-height: 100vh;
}

h1 {
    margin: 0 0 18px 0;
    font-size: 18px;
    color: #12202b;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(var(--size), 1fr));
    gap: 16px;
    max-width: 980px;
}

.card {
    --bg: linear-gradient(135deg, #6dd3ff, #7b61ff);
    background: var(--bg);
    height: var(--size);
    position: relative;
    display: flex;
    align-items: flex-end;
    padding: 14px;
    color: #fff;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
    transition: transform 0.18s ease, box-shadow 0.18s ease;
    border-radius: 30px;
    corner-shape: bevel;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.18);
}

.label {
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
}

.hint {
    margin-top: 16px;
    color: #44535f;
    font-size: 13px;
}</style></head><body><div class="wrap">
    <h1>Corner-shape demo (using a --corner-shape custom property)</h1>

    <div class="grid">
        <div class="card">
            <div class="label">Cut corner</div>
        </div>
    </div>

</div></body></html>