Looking for minimal theme no title no menu no look

[Bill]

Hi

I am new here and don't know much about this CMS.

I wanted to use Getsimple CMS to show content in small windows via iframe in a virtual tour.

So i am just needing my client to change their content of page.

I don't need any look or title or menu or anything except the wysiwig field to show on a blank background.

How can i modify an existing theme to do that ? Or is there a theme like that i can download ?

Thanks for your help.