<style>
.btn { padding: 10px 25px 10px 25px;
background-color: #b4975a;
border-radius: 25px;
font-size: 14px!important;
vertical-align:middle;
font-family: 'Lato Bold', Arial, Helvetica, sans-serif;
color: white!important;
cursor: pointer;
text-align:center;
}
<link rel="stylesheet" href="http://fontawesome.io/assets/font-awesome/css/font-awesome.css">
</style>
<script type="text/javascript" src="https://www.MyHealth1st.com.au/wp/wp-content/uploads/2014/05/popup_practice.js"></script>
<div class="1stAvailableWidget widget" id="PracticeIDHere" style="cursor:pointer;"> <p class = "btn btn-primary" style="text-align:center;"> <i class="fa fa-calendar" aria-hidden="true"></i> Book Now</p> </div>