*{
    text-align: center;
    font-family: Helvetica, sans-serif;
}
header, nav,footer{
    color: white;
    padding: 2px;
}
header, footer{
    background-color: darkgreen;

}
nav{
    background-color: forestgreen;
}
section{
    float: left;
    background-color: lightgreen;
    width: 33.3%;
    height: 550px;
    padding-top: 10px;
    overflow: auto;
}
h2{
    width: 33%;
    display:inline-block;
}
table, td, th{
    border: 1px solid darkgreen;
}
table{
    width: 90%;
    border-collapse: collapse;
}
#srodek img{
    width: 95%;
    border-radius: 8px;
}
#lewa tr:hover{
    background-color: forestgreen;
}
footer{
    clear:both;
}