body{
    background: url("https://pbs.twimg.com/media/ECXduBHWkAIJB9j.jpg")no-repeat;
    background-size: 100%;
    background-color: #888888;
    font-family: "Segoe Script";
}

@media screen and (max-width: 1499px){
    body{
        background-size: 130%;
        background-position: 80% 45%;
    }

    iframe {
        width: 30%;
    }
}

.titre{
    text-align: center;
    color: white;
}

iframe {
    margin: 9px;
}


nav.menu ul li {

    display: inline-block;
    padding:15px;
    font-size: 25px;

}

nav.menu ul li.btn a{

    color: white;
    background-color: black;
    text-decoration: none;

}

nav.menu ul li.btn:hover a{

    color: black;
    background-color: white;
    transition: 0.3s all;
}

.suivant{
    float: right;
    width: 60px;
    position: absolute;left: 90%;
    bottom: -5.5em;
}

.retour{
    float: left;
    width: 60px;
    position: absolute;
    bottom: -5.7em;
    transform: scaleX(-1);
}

.copyright {
    text-align: center;
    position: absolute;
    bottom: -1;
    width: 98%;
    color: white;
    font-size: 25px;
}