body {
    margin: 0px;
}

div.zone1 {
    display: flex;
    height: 20vh;
    width: 100vw;
}

iframe.frzone1 {
    flex-grow: 1;
    border: none;
}

div.zone2 {
    display: flex;
    float: left;
    height: 80vh;
    width: 30vw;
}

div.zone3 {
    display: flex;
    float: right;
    height: 48vh;
    width: 70vw;
}

div.zone4 {
    display: flex;
    float: right;
    height: 32vh;
    width: 70vw;
}