As case studies are often printed out
to be read offline, it's recommended that you choose an
easy-to-read
font, such as Arial or Times Roman, and allow a generous font size.
Allow yourself plenty of white space.

How to write a Case Study
You can put yourself at a considerable disadvantage if
you use an obscure font, which makes it hard to read or by choosing color schemes that
strain the reader's eye, such as violet text on a white background.
The
classic black text on a white
background is hard to fault.
Although white text on black has its
supporters, if you choose this you may find that many readers will not
print out your document as the printing costs will be excessive, e.g.
for black ink toners.
Learn How to Write Case Studies