.coupon-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding: 30px;
}
.coupon-box {
  background: #fff;
  border: 1px solid #ddd;
  width: calc(33.333% - 20px);
  padding: 20px;
  box-shadow: 0 0 8px rgba(0,0,0,0.05);
  border-radius: 10px;
}
.coupon-box h3 {
  margin: 0 0 10px;
}
button {
  background: #1e73be;
  color: white;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
}