body {
  font-family: "Arial", sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
  color: #333;
  line-height: 1.6;
}

p {
  margin-bottom: 1em;
}

header {
  background: linear-gradient(90deg, #0056b3, #003d80);
  color: white;
  padding: 20px 0;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  position: relative;
}

header h1 {
  margin: 0;
  padding: 0;
  font-size: 2em;
  z-index: 1;
  position: relative;
}

header::after {
  content: "";
  background: rgba(0, 0, 0, 0.3);
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 0;
}

.container {
  display: flex;
  flex-direction: column;
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

main {
  margin: 20px auto;
  padding: 20px;
  background-color: white;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  border-radius: 10px;
}

h1 {
  color: #ffffff;
}
h2 {
  color: #0056b3;
}

section {
  margin-bottom: 20px;
}

.gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
}

.gallery1 {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}

.gallery img {
  width: 100%;
  max-width: calc(50% - 10px);
  flex: 1 1 48%;
  height: auto;
  border: 1px solid #ccc;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.btn-retour {
  display: inline-block;
  padding: 10px 20px;
  margin-top: 20px;
  background-color: #0056b3;
  color: white;
  text-decoration: none;
  border-radius: 5px;
  transition: background-color 0.3s, transform 0.3s;
  text-align: center;
}

.btn-retour:hover {
  background-color: #004494;
  transform: scale(1.05);
}