Curtains

<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<style>
  body {
    background: #4f77ff;
    display: flex;
    gap: 20px;
    margin: 0;
    justify-content: center;
    align-items: center;
  }
  div:nth-child(odd) {
    width: 60px;
    height: 200px;
    background: #1038bf;
  }
  div:nth-child(even) {
    width: 20px;
    height: 200px;
    background: #ffffff;
  }
</style>