.environnement-container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 2rem;
  background: #fff;
  border-radius: 1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,.15);
  font-family: Arial, Helvetica, sans-serif;
  color: #222;
  line-height: 1.6;
}

h1 {
  margin-bottom: 2rem;
}