Letter B

<div></div>

<style>
  body {
    background: #6592cf;
    margin: 0;
  }
  div {
    width: 100px;
    height: 80px;
    background: #060f55;
    border-radius: 0 80px 80px 0;
    translate: 110px 80px;
    box-shadow:
      0 60px #060f55,
      40px 60px #2e3b9f,
      40px 0px #2e3b9f,
      80px 60px #515dbd,
      80px 0px #515dbd;
  }
</style>