html {
    font-family: Arial, Helvetica, sans-serif;
  }
  
  table {
    border-collapse: collapse;
    border: 2px solid rgb(200,200,200);
    letter-spacing: 1px;
  }
  
  td, th {
    border: 1px solid rgb(190,190,190);
    padding: 10px 20px;
  }
  
  th {
    background-color: rgb(250, 250, 250);
    font-size: 120%;
  }
  
  td {
    text-align: center;
    width: 20ex;
  }
  
  tr:nth-child(even) td {
    background-color: rgb(250,250,250);
  }
  
  tr:nth-child(odd) td {
    background-color: rgb(230,230,230);
  }
  
  audio {
    max-width: 20ex;
  }

  hr {
      margin: 1em 0;
  }