JQ Hide/Show Contacts Toggle SRC

<center>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$('*').parent("div").toggle("1");
});
});
</script>
<h2>
<body bgcolor="lightblue">
<button class="hide">Hide/Show Contacts Toggle</button>
<div class="ex">
<p>Contact: First, Lastname<br><br>
Contact: First, Lastname<br>
</p>
</div>