/* Reset CSS */
body, h1, h2, h3, p, ul, li, table, th, td {
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: Arial, sans-serif;
    background-color: rgb(215, 255, 255);
  }
  

  .ZigZag_3D {
    background: linear-gradient(135deg, #defffc 25%, transparent 25%) -20px 0/ 40px 40px, linear-gradient(225deg, #ffffff 25%, transparent 25%) -20px 0/ 40px 40px, linear-gradient(315deg, #ffffff 25%, transparent 25%) 0px 0/ 40px 40px, linear-gradient(45deg, #ffffff 25%, #ffffff 25%) 0px 0/ 40px 40px;
  }

  header {
    background-color: #505050;
    color:#FFF;
    text-align: center;
    padding: 20px 0;
 
  }
  
  nav ul {
    list-style-type: none;
    text-align: center;
  }
  
  nav ul li {
    display: inline;
    margin-right: 20px;
  }
  
  nav ul li a {
    color: #333;
    text-decoration: none;
  }
  
  nav ul li a:hover {
    color: #777;
  }
  
  main {
    padding: 20px;
  }
  
  section {
    margin-bottom: 30px;
  }
  
  h2 {
    color: #333;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
  }
  
  th, td {
    padding: 8px;
    border-bottom: 1px solid #aeaeae;
  }
  
  footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
  }