body, html {
    height: 100%;
}

.stranica {
    background-color: #222;
    background-image: -webkit-linear-gradient(rgba(34,34,34,.8),rgba(34,34,34,.8)),url(https://lab.matijakolaric.from.hr/stranica/ux/slike/pixellHari.svg);
    background-image: linear-gradient(rgba(34,34,34,.8),rgba(34,34,34,.8)),url(https://lab.matijakolaric.from.hr/stranica/ux/slike/pixellHari.svg);
    background-position: bottom left;
    background-repeat: no-repeat;
    background-size: auto 55%;
    color: #fff;
}