a { 
    color: blue;
}

i {
    font-style: italic;
}

b {
    font-weight: bold;
}

small {
    font-size: 90%;
}

big {
    font-size: 110%;
}

pre {
    color: black;
    font-weight: bold;
    background-color: gray;
}

h1 {
  display: block;
  font-size: 200%;
  font-weight: bold;
}

h2 {
  display: block;
  font-size: 150%;
  font-weight: bold;
}

h3 {
  display: block;
  font-size: 117%;
  font-weight: bold;
}