nav {
    margin-left: 30px;
}

main {
    margin-left: 30px;
    margin-right: 30px;
}

h1 {
    text-align: center;
    background-image: url('bandeau_montagne.jpg');
    background-attachment: fixed;
    padding: 250px;
    border-radius: 20px;
    color: white;
    font-size: 4em;
    margin-top: 0;
    margin-bottom: 0.1em;
}

h2 {
    color: rgb(0, 25, 71);
    margin-top: 0.4em;
}


.menu {
    text-decoration: none;
    color: white;
    display: inline-block;    
    background-color: #02005e;
  border: none;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  font-size: 16px;
  border-radius: 10px;
}

.photo-ligne {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-content: space-around;  /* aucun impact si 1 seule ligne */
    align-items: center;  /* centrage horizontal */
}

.photo-box {
    margin: 20px;
}

.photo-label {
    text-align: center;
    font-size: small;
}

#error_msg {
    color: rgb(255, 0, 0);
    font-weight: bold;
}