body{font-family:arial;
background-color:rgba(99, 99, 99, 0.5);

}

.background{background-color: rgba(99, 99, 99, 0.2);
padding:1em;}

footer>a{color:black;}

#logoheader{margin-bottom:-2em;
}
#50ans{margin-left:2em;
}

#merci{margin-bottom:10em;}