header {
    text-align: center;
    margin-top: 5px;
  }


  table {
    text-align: center;
    margin: 20px auto;
  }

  td {
    border: 2px solid black;
    background-color: yellow;
  }


.green {
    background-color: green;
}

.greenyellow {
    background-color: greenyellow;
}

.orange {
    background-color: orange;
}

.red {
    background-color: palevioletred;
}


.gray {
    background-color: #C0C0C0;
    border: 2px solid #C0C0C0;
}

body {
    font-family: Arial, Helvetica, sans-serif;
}