html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "Arial", sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: #ffffff;
  /* L'image de fond est chargée depuis le dossier images. */
  background: url('images/background.jpg') no-repeat center center fixed;
  background-size: cover;
}

.overlay {
  background: rgba(0, 0, 0, 0.55);
  padding: 2rem;
  border-radius: 8px;
  max-width: 90%;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

p {
  font-size: 1.2rem;
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.8rem;
  }
  h2 {
    font-size: 1.4rem;
  }
  p {
    font-size: 1rem;
  }
}