body {
    margin: 0;
}

.flexCollumn {
    flex-direction: column;
    display: flex;
    float: left;
}

.BlueBox {
    background-color: blue;
    box-sizing: border-box;
    border: 3px solid black;
    float: left;
    width:80vw;
    height: 40vh
}

.WhiteBox-1 {
    background-color: white;
    box-sizing: border-box;
    border: 3px solid black;
    width:20vw; height: 20vh;
    float: right
}

.WhiteBox-2 {
    background-color: white;
    box-sizing: border-box;
    border: 3px solid black;
    width:40vw; height: 20vh;
}
.WhiteBox-3 {
    background-color: white;
    box-sizing: border-box;
    border: 3px solid black;
    width: 40vw; height: 20vh;
    float: right
}

.YellowBox-1 {
    background-color: yellow;
    box-sizing: border-box;
    border: 3px solid black;
    width:20vw; height: 60vh;
    float: left
}
.YellowBox-2 {
    background-color: yellow;
    box-sizing: border-box;
    border: 3px solid black;
    width:20vw; height: 40vh;
    float: right;
}

.RedBox-1 {
    background-color: red;
    box-sizing: border-box;
    border: 3px solid black;
    width:20vw; height: 60vh;
    float: right;
}
.RedBox-2 {
    background-color: red;
    box-sizing: border-box;
    border: 3px solid black;
    width:40vw;
    height: 40vh;
    float: right
}