Party Hat

<div></div>
<div></div>
<div></div>
<style>
  body {
    background: #73c6ea;
    display: grid;
    place-items: center;
  }
  div {
    border-left: 125px solid transparent;
    border-right: 125px solid transparent;
    border-bottom: 180px solid #0d1335;
    position: absolute;
  }

  div:nth-child(1) {
    border-bottom: 140px solid #dc6638;
    margin-top: 40px;
    z-index: 1;
  }
  div:nth-child(3) {
    border-bottom: 100px solid #fbfae2;
    margin-top: 80px;
    z-index: 1;
  }
</style>