.zdroje {
    text-align: center;
    font-size: 20px;
    font-family: "Quicksand", sans-serif;
    font-optical-sizing: auto;
    font-style: normal;
    color: rgba(236, 236, 236, 0.864);
}

body {
    background-image: url(background.jpg);
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: 100% 100%;
}