Remove fixed width from cards

[Amorpheuz]

Is your feature request related to a problem? Please describe.
Cards have been allocated fixed sizes within the CSS file which shouldn't be done as it reduces their responsiveness.

Describe the solution you'd like
Make use of Card's Sizing Utilities under Bootstrap to size them. Preference should be given in the following order:

1. Grid Markup
2. Utilities
3. Custom CSS (Only via rems not pixels)

Only switch to custom CSS if the two above don't fulfill the required need! I think the solution of Grid Cards should be the most optimal as it will also easily group up all the cards!

Additional context
More information can be found at Card Sizing, I recommend reading the full Cards page though.