>>"could not select these with CSS and make a change doing class.div b {}"

We suggest that you double check your CSS code, as it may contain some kind of incorrect entries and that can be a reason of why you can't change the visual settings of a widget. For example, the code you cited:

class.div b {} — it doesn't look all correct, it should be like: div b {}

>> "How can I, make my feed scrollable..."

Please try to include the widget into a separate <div> and use CSS to define its height: 300px and add a scroll parameter overflow-y: auto.

I placed it inside of a div and a section.
I then assigned CSS classes to the feed, and to the <script> that I drop in.

The feed intelligently takes the colors from my global a tags however I cannot edit the individual feed items.

I did inspect element and found nested in my div a 'b' tag for each title and an 'em' tag for each description.

I could not select these with CSS and make a change doing class.div b {}.

I also, cannot shrink my feed to the confines of the div it's nested in, this requires me to change how many feed items are allowed in my widget settings and forbids me from fine tuning the section on my sites theme.

How can I, make my feed scrollable, or control it with CSS tags in order to change font sizes and confine it to my <div> tag?