html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
}

.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("GoParnu.jpg");
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    background-color: rgba(0, 0, 0, 1); /* Musta taustaväri, 100% läpinäkyvyys */
}