html, body{
    height: 100%;
    margin: 0;
}
.container{
    width: 100%;
    height: 100%;
    background-image: url('/assets/images/logo.png');
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-position: center center;
    opacity: 0;
    animation: fadein 1.5s ease-in-out forwards;
}

@keyframes fadein {
    from{
        opacity: 0;
    }    
    to{
        opacity: 1;

    }
}