div{
   position:absolute;
   border:5px solid black;
   width:400px;
    height:400px;
}
div > div{
    position:absolute;
    width:150px;
    height:150px;
}
div:nth-child(1){
    border:3px solid blue;
    top:10%;
}
div:nth-child(2){
    border:3px solid magenta;
    top:15%;
}
div:nth-child(3){
    border:3px solid green;
    top:5%;
    left:15%;
}
div:nth-child(4){
    border:3px solid #afdfdf;
    top:10%;
    right:10%;
}