Web and Digital Communications provides the CMS and support in hopes that users will not need to add custom code or custom styling. This includes extra CSS, PHP, Javascript or any others.
We highly recommend looking into how to use Source Code Assets, especially if you are trying to embed code from a different website (which does happen and we can help if you struggle.)
And if you need some extra styling for your content, check out our Snippet Showcase, which will show you all of the pre-programmed style options on items from Cards, to tables, to videos and more.
If you come to the conclusion that you still need to add custom elements, send us a web support ticket with your reasoning and we can discuss it. Thanks!