/* Exercice 2 - Box Model */

.page-ex2 {
  max-width: 800px;
  margin: 30px auto;
  padding: 0 20px;
}

/* content-box */
.box-content {
  box-sizing: content-box;
  width: 300px;
  padding: 20px;
  border: 5px solid #e74c3c;
  margin: 15px;
  background: #fadbd8;
}

/* border-box */
.box-border {
  box-sizing: border-box;
  width: 300px;
  padding: 20px;
  border: 5px solid #27ae60;
  margin: 15px;
  background: #d5f5e3;
}

/* Centrage horizontal */
.center-h {
  width: 400px;
  margin: 0 auto;
  background: #d6eaf8;
  padding: 20px;
  border-radius: 8px;
  text-align: center;
}

/* Centrage horizontal + vertical */
.center-container {
  height: 200px;
  background: #f0f0f0;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 8px;
  margin-top: 20px;
}
.center-both {
  width: 200px;
  background: #a9cce3;
  padding: 20px;
  border-radius: 8px;
  text-align: center;
}