Inline example - https://stackblitz.com/edit/inline-appointment-widget-for-we...
Node JS example - https://stackblitz.com/edit/appointment-booking-widget-in-no...
WordPress plugin to embed with shortcode- https://wordpress.org/plugins/dayschedule-appointment-event-...
============
[dayschedule url="https://meet.dayschedule.com" type="popup"]
More customization options: https://dayschedule.com/widget
Let me know if any question or feedback :-)