body {
  width: 960px;
  margin: 2em auto;
  font-family: Arial, sans-serif;
  font-size: 16px;
  line-height: 1.4;
}

h1 {
  font-size: 2em;
  font-weight: normal;
  margin: 0 0 1rem 0;
}

section {
  padding: 2rem;
  border: 1px solid #ccc;
  margin: 4rem 0;
  background-color: #fff;
}

aside {
  font-size: 24px;
  font-family: Georgia, Serif;
  font-style: italic;
  background-color: #aaa;
  color: #fff;
  padding: 1.5rem;
  width: 15rem;
}

#callout1 {
  float: right;
}

#callout2 {
  position: absolute;
  margin-left: 639px;
  margin-top: 72px;
}

#callout3 {
  background-color: green;
  position: fixed;
  top: 0;
  right: 0;
}

#callout4_first {
  background-color: red;
  position: absolute;
  margin-top: 35px;
  margin-left: 300px;
  z-index: 2;
}

#callout4_second {
  background-color: black;
  position: absolute;
  z-index: 1;
  margin-left: 310px;
  margin-top: 45px;
}