.container {
  display: flex;
  gap: 20px; 
}
.box {
  flex: 1; 
  padding: 20px;
  background-color: #f0f0f0;
  border: 1px solid #ccc;
}
@media (max-width: 600px) {
  .container {
    flex-direction: column; 
  }
}