main .fondPhoto {
    background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('../che44/pirates.webp');
    background-repeat: no-repeat;
    background-position: center top 63px;     
    background-attachment: fixed;
}
footer {
    background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../che44/pirates.webp');
    background-repeat: no-repeat;
    background-position: center bottom;     
    background-attachment: fixed;
}
h1.fondPhoto {
    font-size: 50px;
}
header label {
    cursor: pointer;
    color: white;
    width: 16px;
    display: initial;
}
/* menu réduit */
nav {
    display: none;
}
nav li {
    margin-top: 10px;
}
input[type=checkbox] ~ label .ouvrir {
    display: inherit;
}
input[type=checkbox] ~ label .fermer {
    display: none;
}
/* menu développé */
input[type=checkbox]:checked ~ nav {
    display: flex;
    width: 100%;
}
input[type=checkbox]:checked ~ label .ouvrir {
    display: none;
}
input[type=checkbox]:checked ~ label .fermer {
    display: inherit;
}