Embed code I have placed using text element is being cut off. It does not have the proper height. How can I resolve this?

It may happen that iframe created by your embed code gets cut off.

Please do the following to resolve this:
1. Define Custom Id for the section containing embed code (for example: section_1)

2. Add the following statements to Custom CSS field of Appearance > Customize > General panel 

#section_1 iframe {
    height: 150px !important;
}

Adjust the height according to your needs.