body
{
    background-image: url("http://www.geocities.ws/eposlovanje/close-up-concrete-creativity-908286.jpg");
}
.jumbotron
{
    background-color:black;
}
.naslov
{
    text-align: center;
    color:white;
}
.tekst
{
    color:white;
}
td
{
    vertical-align:top;
}