You can even place, but would have to specify within wrapper divs with column references t3 framework or create your custom divs to put inside your wrapper measures, creating area the size you want via custom css to your box youtube, dividing the area within a wrapper manually behind the text editor (html code) in the module to give the size of the box you want. It's simpler, I think you replace the wrapper inside the block you use for another class. Preferably create a copy of your block, give new name and make new call + 1 inside your template for your presonalizado block block, let all the marking block within a container (taking advantage of marking the subject, I think that's what you wish), marking with divs inside container, if new divs (names you created), only set in custom.css measures of its new divs are created.