.cell{
    background-color: #0493ED;
    width: 200px;
    height: 200px;
    margin: 10px;
    font-size: 100px;
    color: white;
    text-align: center;
    line-height: 200px;
  }
  #main{
    min-height: 100%;
    min-height: 100vh;
   
    display: flex;
    align-items: center;
  }