Edit in JSFiddle

<div>
	<div class = "content">Contenido 1</div>
	<button class = "showHide">Show/Hide</button>
</div>
	
<div>
	<div class = "content">Contenido 2</div>
	<button class = "showHide">Show/Hide</button>
</div>
	
<div>
	<div class = "content">Contenido 3</div>
	<button class = "showHide">Show/Hide</button>
</div>