@joseph-benguira found some alternative html code ...
<a href="https://wa.me/15551234567" title="Chat with us on WhatsApp" style="margin: 0 0 20px 0 !important;
height: 52px; min-width: 52px; padding: 10px 0px 0px 10px; position: fixed !important; bottom: 10px; right: 20px; z-index: 999999999 !important; background-color: #00E785;
box-shadow: 4px 5px 10px rgba(0, 0, 0, 0.4); border-radius: 100px" >
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</a>
Source: https://medium.com/@wassenger/how-to-use-whatsapp-click-to-chat-button-9b360f551b6b
Or just:
https://wa.me/[your phone number]
if you do not want a floating button. And here's a button that you can attach the url to:
5ae21cc526c97415d3213554.png