Pyramid

<div></div>
<div></div>
<p></p>
<style>
  body {
    background: #f0cd48;
    display: grid;
    place-content: center;
    place-items: center;
  }

  div {
    position: absolute;
  }

  p {
    content: '';
    width: 100px;
    height: 100px;
    background: #66284a;
    position: absolute;
    top: 64px;
    left: 50%;
    translate: -50% -50%;
    border-radius: 50%;
    z-index: -1;
    box-shadow:
      100px 140px #66284a,
      -100px 140px #66284a;
  }
  div:nth-child(1) {
    translate: 0 5px;
    width: 140px;
    height: 100px;
    background: #66284a;
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    z-index: 1;
  }
  div:nth-child(2) {
    width: 200px;
    height: 140px;
    background: #f0cd48;
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
  }
</style>