Kuwait

<div></div>
<style>
  body {
    background: linear-gradient(
      to bottom,
      #13aa4b 0 100px,
      #ffffff 100px 200px,
      #ec1e25 200px
    );
    margin: 0;
  }

  div {
    height: 100px;
    border-top: 100px solid transparent;
    border-bottom: 100px solid transparent;
    border-left: 120px solid;
  }
</style>