body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #f0f0f0;
}
.container {
  display: flex;
  gap: 40px;
}
.square {
  width: 200px;
  height: 200px;
  border-radius: 8px;
}
.red {
  background-color: #e74c3c;
}
.blue {
  background-color: #3498db;
}