When I started working at Canvas, most of the signed in pages of the website, and a few other pages, had a very inconsistent look and feel, as far using the same font size, color, buttons, layout, height, weight of fonts, etc… The first I did was to create a style guide based on what was there, showing the inconsistencies and then creating a new style guide, that is reflective of the current look and feel and design (it is a living style guide, as it is updated on a regular basis). After many months of cleaning up, the website finally had a consistent look and feel to it and gave the user a much better user experience.