<div>
  <h1>1. No CSS applied</h1>
  <div>2. Adjacent Sibling</div>
  <h2>3. No CSS applied</h2>
  <h3>4. Adjacent Sibling</h3>
  <div>5. No CSS applied</div>
  <div>6. No CSS applied</div>
  <h1>7. No CSS applied</h1>
  <div>8. Adjacent Sibling</div>
</div>

h1 + div {
  color: red;
}

h2 + h3 {
  color: blue;
}