* {
    box-sizing: border-box;
  }
  
  body {
    font-family: Arial, Helvetica, sans-serif;
  }
  
  /* Style the header */
  .header {
    background-color: #f1f1f1;
    padding: 30px;
    text-align: center;
    font-size: 35px;
  }
  
  /* Container for flexboxes */
  .row {
    display: -webkit-flex;
    display: flex;
  }
  
  /* Create three unequal columns that sits next to each other */
  .column {
    padding: 10px;
    min-height: 300px;
    
  }
  
  /* Left and right column */
  .column.left {
     -webkit-flex: 1;
     -ms-flex: 1;
     flex: 1;
     background-color: #4CAF50
  }
  .column.right {
      -webkit-flex: 2;
      -ms-flex: 2;
      flex: 2;
  }
  
  /* Middle column */
  .column.middle {
    -webkit-flex: 2;
    -ms-flex: 2;
    flex: 2;
  }
  
  /* Style the footer */
  .footer {
    background-color: #f1f1f1;
    padding: 10px;
    text-align: center;
  }
  
  /* Responsive layout - makes the three columns stack on top of each other instead of next to each other */
  @media (max-width: 600px) {
    .row {
      -webkit-flex-direction: column;
      flex-direction: column;
    }
  }

  /* button style */
  .button {
      background-color: #4CAF50; /*green*/
      border: none;
      color: white;
      padding: 15px 32px;
      text-align: center;
      text-decoration: none;
      display: inline-flex;
      font-size: 16px;
      border-radius: 8px;
      transition-duration: 0.4s;
      -webkit-transition-duration: 0.4s;
  }
  .button:hover {
      background-color: whitesmoke;
      color: black;
  }
  .button.nav {
      display: block;
      width: 100%;
      border-radius: 0px;
  }

  /* table style */
  table {
    font-family: arial, sans-serif;
    border-collapse: collapse;
    width: 100%;
  }
  
  td, th {
    border: 2px solid black;
    text-align: left;
    padding: 8px;
  }
  
  tr:nth-child(even) {
    background-color: #dddddd;
  }