CSS border-top-right-radius Property - Playground Example

<!DOCTYPE html><html><head><style type="text/css">.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #f0f4f8;
  font-family: Arial, sans-serif;
}

.card {
  width: 320px;
  padding: 24px;
  background: #fff;
  border: 2px solid #2b7cff;
  border-top-right-radius: 40px;
  box-shadow: 0 6px 18px rgba(43, 124, 255, 0.12);
}

.corner-label {
  display: inline-block;
  background: #2b7cff;
  color: #fff;
  padding: 6px 10px;
  border-radius: 4px;
  font-size: 13px;
  margin-bottom: 12px;
}

p {
  margin: 0;
  color: #333;
  line-height: 1.4;
}</style></head><body><div class="container">
  <div class="card">
    <div class="corner-label">Rounded top-right</div>
    <p>border-top-right-radius: 40px;</p>
  </div>
</div></body></html>