div#title {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    height: 90px;
    width: 100%;
}

div#title iframe {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 90px;
    width: 100%;
}

div#list {
    position: fixed;
    top: 90px;
    left: 0;
    bottom: 0;
    height: 250px;
    width: 20%;
}

div#list iframe {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
}

div#soorten {
    position: fixed;
    top: 340px;
    left: 0;
    bottom: 0;
    width: 20%;
}

div#soorten iframe {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
}

div#hoofdstukken {
    position: fixed;
    top: 90px;
    left: 20%;
    bottom: 0;
    width: 80%;
}

div#hoofdstukken iframe {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
}

iframe {
  border: 0;
}