.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 10px;
  max-width: 800px;
  margin: 0 auto;
}

.card {
  border: 1px solid #000;
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  height: 160px;
  font-family: sans-serif;
  position: relative;
  overflow: hidden;
}

.card-header {
  background-color: #000;
  color: #fff;
  width: 100%;
  text-align: center;
  padding: 4px 0;
  font-size: 12px;
  font-weight: bold;
}

.card-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  font-weight: bold;
  color: #000;
}

.code {
  color: #fff;
}

.image-area {
  background-color: #fff;
}