body {
	background-image: url("image/fondpessi.jpg");
	background-repeat: no-repeat;
	background-position-x: top;
	background-size: 100%;
    margin: auto;

} 


#logo {
position: absolute;
left: 40%;
top: 20%;
}

#boutonplay {
    position: absolute;
    left: 40%;
    top: 40%;
}