Using customized survey in a popover intercept

I have a survey using customized CSS and it's displayed fine by itself in preview mode. However, when I use the survey as part of an intercept (tried responsive dialog and popover) it is not using any of the CSS or the logos, and instead using the settings from the Look and Feel settings of the survey. Essentially what I want is to have the survey field display as an intercept to users upon visiting the page so if the above is not realistic or there's an alternative approach/suggestion, I am open to it. Thanks in advance.
GB