body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 10px 0;
    text-align: center;
}

ul {
    list-style-type: none;
}

ul li {
    display: inline;
    margin: 0 15px;
}

main {
    padding: 20px;
}

.index {
    background-image: url('OIP.png');
}

.o-nama {
    background-image: url('Earth_hero.jpg');
    background-size: cover;
}

.pozadina{
    background-color: rgb(0, 0, 43);
}

.text{
    text-align: center;
    font-size: 30px;
}