.simulateur-chaise {
  text-align: center;
  background: #f8f8f8;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.simulateur-chaise input {
  margin-top: 1rem;
}
.simulateur-chaise canvas {
  margin-top: 1rem;
  border: 1px solid #ccc;
  max-width: 100%;
}