h1, h2, h3, h4, h5 {
  font-weight: bold;
  margin: 10px 0;
}

body {
  font-size: 12px;
  font-family: Arial, Helvetica, sans-serif;
}

p {
  margin: 5px 0;
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

#foo, #bar {
  border: 1px solid #CCC;
  padding: 20px;
  margin: 10px 0;
  border-radius: 5px;
}