Embed

1. https://savvycal.com/

No width or height customisations from the EUI side

Fiddle

https://jsfiddle.net/adcsjqe8/1/

Help article

https://docs.savvycal.com/article/6-embedding-links-on-your-website#inline

Iframe CSS

  border: 0px;
  border-radius: 12px;
  width: 100%;
  max-height: none;
  box-shadow: rgba(0, 0, 0, 0.1) 0px 0px 0px 1px;
  max-width: none;
  display: block;
  min-height: 640px;

https://jsfiddle.net/adcsjqe8/1/

2. https://app.youcanbook.me/

Fiddle

https://jsfiddle.net/adcsjqe8/1/

Help article

https://support.youcanbook.me/hc/en-us/articles/17297710335767-Embed-Your-Booking-Page-in-a-Website#h_01HZ5XSWNXCDMCQWX06WQCVM56

EUI screenshot