h2 {
  color: red;
}

h2 + div {
  color: green;
}

.myList li {
  border: 1px solid green;
}

.myClass {
  background: green;
}

#myId {
  background: yellow;
}

.myClass.otherClass {
  color: white;
}

section > div:last-child {
  border: 1px solid pink;
}