Modifying link colors/CSS. Also experimenting with changing padding on various div's and text elements from percentages to em's. I didn't want to nest so many em's, but they yield a more consistent visual padding without so many (if any) necessary breakpoints.
Reverted padding back to percentages. I want to avoid cascading em's, so if I have to add some more breakpoints, so be it! Also, made the footer background image into a mixin. Applied the mixin to the body rather than the footer, but the image still does not stick to the bottom of the page.
Playing with breakpoints for 'container' top/bottom padding, since they get too big on larger screen sizes.
Playing with the 3-column layout for larger screen sizes. I have given the three columns, called 'category', a red background to help me see where the widths don't match up to their container div, 'article.' I'll need to work on this some more.