* {
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
}

body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    height: 100vh;
    margin: 0;
    overflow: clip;
}

img {
    cursor: grab;
}

#stapel {
    height: 200px;
    margin: 100px;
    z-index: 1000;
}

#fluss {
    height: 400px;
}