* {
    font-size:small;
}

h1 {
   font-size:x-large;
   border-bottom: black solid 2px;
   text-align:center;
   padding:20px;
}

h2 {
  font-size:large;
  border-bottom:black solid 1px;
}

pre {
   border: black solid 2px;
   margin-right:20%;
   margin-left:20%;
   background-color:#DDDDDD;
}