.bublina{
    background-image: url("2312_0009835-dekoracni-bublina-pruhledna-modra-51-cm-510.webp");
    opacity: 0.65;
    background-position: center;
    border-radius: 50%;
    z-index: 99999999;
    position: absolute;
    width: 100px;
    height: 100px;
}
#hraci_pole{
    background-image: url("HD-wallpaper-green-nature-with-sunrise-forest-amazing-sun-fresh-relax-perfect-nice-cool-green-good-beauty-nature.jpg");
    background-size: cover;
    height: 775px;
    position: relative;
}