body {
  background-color: #111;
  color: #0f0;
  font-family: monospace;
  text-align: center;
}
#cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 20px;
}
.card {
  background-color: #222;
  border: 1px solid #0f0;
  border-radius: 8px;
  margin: 10px;
  padding: 10px;
  width: 120px;
}