Two ways to embed: iframe (isolated) or script (native). Try the live examples below.
<iframe
src="https://smaart-investment.netlify.app/widget/v1/frame.html?id=smaart-frame&lang=en&tenant=buyandsell.gr&brand=0"
style="width:100%;min-height:680px;border:0"
></iframe>
<script type="module" src="https://smaart-investment.netlify.app/widget/v1/loader.js"></script>
<div id="smaart-widget-root"></div>