CSS Ribbon Generator

.card {
  position: relative;
  overflow: hidden;
  /* other card styles */
}

.ribbon {
  position: absolute;
  right: -25px;
  top: 20px;
  width: 100px;
  padding: 6px 0;
  background: #ef4444;
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.05em;
  transform: rotate(45deg);
  transform-origin: center center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}