<div class="element no1">1</div>
<div class="element no2">👉 2 👈</div>
<div class="element no3">3</div>
<div class="element no4">4</div>
<div class="element no5">5</div>
<div class="element no6">6</div>
.no2 { 
  position: fixed;
  top: 15vh; /* demi boite */
}

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

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