Tasto whatsapp

function wabtn() {
    ?>
    <span class="whatsapp">
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
        <a href="https://wa.me/1XXXXXXXXXX" class="wa-float" target="_blank">
            <i class="fa fa-whatsapp my-float"></i>
        </a>
    </span>
    <?php
}

add_action('wp_footer', 'wabtn');

/*Stili*/
.wa-float{
	position:fixed;
	width:60px;
	height:60px;
	bottom:40px;
	right:40px;
	background-color:#25d366;
	color:#FFF;
	border-radius:50px;
	text-align:center;
  font-size:30px;
	box-shadow: 2px 2px 3px #999;
  z-index:100;
}

.my-float{
	margin-top:16px;
}