.box-1 {
    width: 600px;
    height: 200px;
    background-color: red;
}

.box-2 {
    width: 300px;
    height: 400px;
    background-color: blue;
}

.box-3 {
    width: 100px;
    height: 100px;
    background-color: grey;
}

.box-4 {
    width: 100px;
    height: 250px;
    background-color: grey;
}