body{
    background-color: lightsteelblue;
}
*{
    box-sizing: border-box;
}
.prvi{
    width: 960px;
    background-color: lightblue;
    text-align: center;
    margin: auto;
    margin-top: 100px;
    border: 25px solid lightseagreen;
    border-radius: 45px;
    padding: 20px;
}
.sadrzaj{
    border: 7px solid lightseagreen;
    text-align: center;
    font-size: 25px;
    margin: auto;
    border-radius: 30px;
    padding: 30px;
}