html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
}
body {
    background-image: url('/img/background.png');
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: left center;
}
.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}