* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    height: 100vh;
    width: 100vw;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .container {
    height: 400px;
    width: 400px;
    display: flex;
    flex-wrap: wrap;
  }
  
  .box {
    width: 20px;
    height: 20px;
  }
  
  .redbox {
    background-color: #e24e3f;
  }