cssbattle37

<i class="a"><i class="a b"><i class="a c"></i></i></i>
<style>
  * {background:#6592CF}
  .a {
    width: 250px;
    height: 250px;
    background: #243D83;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  .b {
    width: 150px;
    height: 150px;
    background: #6592CF; 
    transform: translate(-50%, -50%) rotate(15deg);
  }
  .c {
    width: 50%;
    height: 50%; 
    transform: translate(-50%, -50%) rotate(15deg);
  }
</style>