CSS corner-top-right-shape Property - Playground Example

<!DOCTYPE html><html><head><style type="text/css">:root {
  /* size of the decorative top-right corner */
  --card-bg: linear-gradient(135deg, #6dd5fa 0%, #2980b9 100%);
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: #f3f6f9;
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 32px;
}

.wrap {
  width: 360px;
}

.card {
  position: relative;
  padding: 24px;
  background: var(--card-bg);
  color: #fff;
  border-radius: 30px;
  overflow: visible;
  box-shadow: 0 8px 24px rgba(16,24,40,0.08);
  corner-top-right-shape: bevel;
}

.card h1 {
  margin: 0 0 8px 0;
  font-size: 20px;
}

.card p {
  margin: 0;
  font-size: 14px;
  opacity: 0.95;
}
</style></head><body><div class="wrap">
  <div class="card">
    <h1>Corner Shape</h1>
    <p>This card demonstrates a decorative top-right corner shape controlled by a CSS property.</p>
  </div>
</div></body></html>