Aprender a realizar esta ação

<button class="accordion">Section 1</button>
<div class="panel">
  <p>Lorem ipsum...</p>
</div>

<button class="accordion">Section 2</button>
<div class="panel">
  <p>Lorem ipsum...</p>
</div>

<button class="accordion">Section 3</button>
<div class="panel">
  <p>Lorem ipsum...</p>
</div>

.accordion {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  text-align: left;
  border: none;
  outline: none;
  transition: 0.4s;
}

.active, .accordion:hover {
  background-color: #ccc;
}

.panel {
  padding: 0 18px;
  background-color: white;
  display: none;
  overflow: hidden;
}

<a class="button" href="#">¿Cómo descargar desde la página</a>