Diamond Cut

<div></div>
<style>
  body {
    background: #f3ac3c;
    display: grid;
    place-content: center;
  }
  div {
    width: 30px;
    height: 30px;
    background: #1a4341;
    rotate: 45deg;
    box-shadow:
      -60px 0px #f3ac3c,
      0 -60px #f3ac3c,
      -70px 0px #f3ac3c,
      0 -70px #f3ac3c,
      0 0 0 35px #f3ac3c,
      0 0 0 65px #998235;

    translate: -2px;
  }
</style>