body {
    font-family: sans-serif;
    max-width: 600px;
    margin: 20px auto;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
  }
  
  th, td {
    border: 1px solid #ccc;
    padding: 8px;
    text-align: center;
  }
  
  th {
    background: #f0f0f0;
  }
  
  tr.expired {
    background-color: #ffdddd;
  }
  
  tr.week {
    background-color: #ffe0b2;
  }
  
  tr.halfmonth {
    background-color: #ffffcc;
  }
  
  tr.month {
    background-color: #e0f7fa;
  }