Exercice 3 : Flexbox

3.1 Barre de navigation

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
  background-color: #f5f5f5;
}

.nav-links {
  display: flex;
  gap: 15px;
  list-style: none;
  margin: 0;
  padding: 0;
}

3.2 Cartes de même hauteur

.cards {
  display: flex;
  gap: 20px;
}

.card {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 15px;
  border: 2px solid #333;
  border-radius: 8px;
  background-color: #fff;
}