body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.center-text {
  text-align: center;
}

.navbar {
  background-color: #f5f5f5;
  padding: 1em;
}

.nav-links {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 1em;
  padding: 0;
  margin: 0;
}

.nav-links li a {
  text-decoration: none;
  color: #333;
}

.burger {
  display: none;
  font-size: 2em;
  cursor: pointer;
  text-align: right;
}

.hero {
  padding: 2em;
  background-color: #e0f7fa;
}

.btn {
  display: inline-block;
  margin: 1em;
  padding: 0.5em 1em;
  background-color: #0077aa;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}

.btn.secondary {
  background-color: #555;
}

.card {
  max-width: 400px;
  margin: 1em auto;
  padding: 1em;
  border: 1px solid #ccc;
  border-radius: 8px;
}

img {
  max-width: 100%;
  height: auto;
}

@media (max-width: 768px) {
  .nav-links {
    flex-direction: column;
    align-items: center;
  }

  .burger {
    display: block;
  }

  .mission-cards,
  .temoignage-cards {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}