body {
  font-family: Arial, Helvetica, sans-serif;
  background: rgb(187,187,187);
  font-size: 16px;
  overflow-x: auto;
  margin: 0;
  padding: 0;
}

h1 {
  font-size: 150%;
  font-weight: bold;
}

h2 {
  font-size: 125%;
  font-weight: bold;
}

h3 {
  font-size: 110%;
  font-weight: bold;
}