body, html {
    margin: 0;
    padding: 0;
}

.taust {
    position: fixed;
    top: 0;
    width: 100vw;
    height: 100vh;
    margin: 0px;
    z-index: -1;

    background-image: url(pildid/Untitled-2-01.png);
    background-size: cover;
    background-repeat: no-repeat;
}