You can customize the embed code by adding additional query parameters to the iframe src attribute.
The parameters you can set are
nologo=1 – this removes the logo from the page
noinfo=1 – this removes the blurb about entering in your user information
nodescription=1 – this removes the description about the course
nofocus=1 – this disables the form from being the default focus element when the page loads (cursor won’t jump to the form)
An example of this would be