<div class="square1"></div>
<div class="square2"></div>
<div class="square3"></div>
<style>
body {
margin: 0;
background: #6592CF;
display: flex;
justify-content: center;
align-items: center;
}
div { position: absolute }
.square1 {
width: 250px;
height: 250px;
background: #243D83;
}
.square2 {
width: 150px;
height: 150px;
background: #6592CF;
transform: rotate(15deg);
}
.square3 {
width: 75px;
height: 75px;
background: #243D83;
transform: rotate(30deg);
}
</style>