Need help with Tutor Indigo

So I am new to Openedx Tutor as I was a former user of the native version of Openedx only for a few months. I am trying to customize the indigo theme the same way in the native theming. The problem is when i try to add the bootstrap elements they only show up as static elements and even with adding cdns to it nothing happens. What could be the possible mistake that I am doing while customizing it?