.responsive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  background: #f0f0f0;
  padding: 20px;
  border-radius: 8px;
}

.responsive-item {
  background: #673AB7;
  color: white;
  padding: 20px;
  text-align: center;
  border-radius: 8px;
  justify-self: center;
}

@media (max-width: 600px) {
  .responsive-item {
    justify-self: stretch;
  }
}