body
{
margin: 0;
padding: 0;
}
#container
{
width: 900px;
margin-left: auto;
margin-right: auto; 
border:1px solid black;
}
#naglowek{
width: 900px;
height: 200px;
border:1px solid black;
background-color:#A0BD70;
}

.kolumna{
float: left;
width: 298px;
height: 350px;
border:1px solid black;
background-color:#7BAF68;
}

#clear{
clear: both;
}

#stopka{
width: 900px;
height: 150px;
border:1px solid black;
background-color:#538C74;
}