#page_title {
  text-align: center;
  color: blue;
}

#section_title {
  color: purple;
}

body {
  width: 750px;
  margin: 40px;
}

pre {
  background-color: LightGray; 
  padding: 10px;
}

table {
  table-layout: fixed;
  border: 2px solid;
  border-collapse: collapse;
}

tr {
  border: 1px solid black;
}

td {
  text-align: left;
  border: 1px solid black;
  padding: 5px;
}

th {
  background-color: SlateGray;
  color: white;
  text-align: center;
  border: 1px solid black;
  padding: 5px;
}