body {
   font-family: Arial, sans-serif;
   line-height: 1.6;
   margin: 0;
   padding: 0;
   background-color: #f4f4f4;
}
header {
   background: #333;
   color: #fff;
   text-align: center;
   padding: 1rem 0;
}
h1 {
   margin: 0;
}
main {
   padding: 20px;
}
h2 {
   color: #333;
}

#intro {
    text-align: center;
    margin-left: 5%; margin-right: 5%;
}

#title {
    text-align: center;
}

table, th, td {
  border:1px solid black;
  text-align: center;
}