*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

.MainDiv{
    height: 500px;
    width: 100%;
}

.FirstDiv{
    height: 400px;
    width: 400px;
}
.SecondDiv{
    height: 400px;
    width: 400px;
    bottom: 20%;
    left: 5%;

}