<div class="element no1">1</div>
<div class="element no2">2</div>
<div class="element no3">3</div>

.element {
  height: 33.33vh;
}
.no1{
  
}
.no2{
  
  
}
.no3{
  
}

External CSS

  1. https://tim-montmorency.com/timdoc/shared/styles/codepen.css
  2. https://tim-montmorency.com/timdoc/shared/styles/codepen-position.css

External JavaScript

This Pen doesn't use any external JavaScript resources.