I'm not sure if I can or how I would use the JS ( I know nothing about JS) to fix the height to something like 78vh and 965px.
The question box I am trying to fix in height has a JS section that has this in there: 
Qualtrics.SurveyEngine.addOnload(function()
{
/*Place your JavaScript here to run when the page loads*/
});
Qualtrics.SurveyEngine.addOnReady(function()
{
jQuery('.Separator').css('height','0px');
});
Qualtrics.SurveyEngine.addOnUnload(function()
{
/*Place your JavaScript here to run when the page is unloaded*/
});
Is it possible to fix the height of a question box?
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It is set to Modern for the layout currently.