*{ border: 0px; padding: 0px; margin: 0px;}
body { background-color: #cfe190; }

.kontener{
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left:-490px;
  margin-top: -258px;
}

#strona {
  width:980px;
  border:0px solid gray; background-color: #fbfbf8;
}

#naglowek1 { float:left; border:0px solid navy;}
#naglowek2 { float:left; border:0px solid navy;}
#naglowek3 { float:left; border:0px solid navy;}

#naglowek1 .zawartosc {line-height: 0px;
width: 351px;
height: 517px;
}
#naglowek2 .zawartosc {line-height: 0px;
width: 214px;
height: 517px;
}
#naglowek3 .zawartosc {line-height: 0px;
width: 415px;
height: 517px;
}