ISTWCMS-5194 m26lebla banners should look the same regardless of content type

Css has been added to allow the banners to display no matter where its is embeded and adhere to the faculty styling with the default being the current org-default presentation.

There was also additional specificity added so when the banners receive a faculty attached to the slide as per the current banners in homepage theme. This allows the css to be ready for when a faculty branded banner gets embed into a org-default class wrapped website. ( current homepage theme.)