html,body {height: 100%;}
.logo{max-height: 3rem;}
.titre {font-size: 2rem;font-weight: bold;color: #FFF;text-shadow: 0px 0px 20px #171717;}
#connexion {height: 100vh; background-position: center  center; background-size: cover}
.circle {
    width: 2.5rem;
    height: 2.5rem;
    text-decoration: none;
    color: black;
    border-radius: 50%;
}