<a href="#">TIKLA</a>
<p>W3TR</p>

a{display: inline-block; background: #00FF99; padding:20px; border-bottom:4px solid #00CC00; color:#00CC99; text-decoration:none; margin-bottom:20px;}
p{font-size:30px; color:red;}

$("a").click(function(){
  $("p").slideToggle();
});