Rounded corners of Calendly Embed

Hello, does anyone know the code to round the corners of the Calendly Embed frame?
This would help the 2 forms side by side look more consistent as pictured

https://www.nicolacross.com/contact

Thank you kindly in advance.

@beyond_electro Hi! Try adding this code Website > Pages > Website Tools > Custom CSS

body.Es8downQlxiASDyltHtn {
    border-radius: 30px !important;
}

Thank you, unfortunately, that didn't work.

@beyond_electro I suspected so. It's most likely that modifying the Calendly Embed iframe externally using Squarespace custom CSS isn't possible.

Thank you kindly