By following the basic principles outlined here, we can make our LibGuides more accessible to individuals with disabilities.
This screenshot (figure 1) is 350px wide and looks good on computer screens and on an iPhone 5.
I used MS Snippet tool to capture the image, edited it in MS Publisher 2010, saved it as a .png file, and then I resized and autocorrected it with MS Picture Manager.
Figure 1. PubMed screenshot 350px wide.