<div class="container_1">
    <h3> 1st element </h3>
</div>
<div class="container_2">
    <p> some other elements</p>
    <div class="container_3">
        <p> some other elements</p>
        <h3>2nd element</h3>
        <h4>[The 1st element should in here]</h4>
    </div>
</div>

.container_1, .container_2, .container_3 {
  min-width: 200px;
  min-height: 200px;
  border: solid 2px lightblue;
  margin: 10px;
}
.container_2 {
  border: solid 2px gray;
}
.container_3 {
  border: solid 2px chocolate;
}