body {
  background-color: white;
}
#black {
  width: 50%;
  padding: 40px;
  margin: 20px;
  background-color: black;
}
#red {
  width: 50%;
  padding: 40px;
  margin: 20px;
  background-color: red;
}
#green {
  width: 50%;
  padding: 40px;
  margin: 20px;
  background-color: green;
}
#main {
  position: relative;
}
img {
  width: 10%;
  position: absolute;
  top: 7%;
  left: 25%;
}