body{
    background: url("Sans-titre-1.jpg");
    background-size: cover;
    background-position-x: center;
    height: 100vh;
    align-items: center;
    position: relative;
}
.button{
    width: 100%;
    position: absolute;
    text-align: center;
    margin-top: 50vh;
}

.ConnectButton{
    width: 500px;
    
}