Let's search for some other non-percentage-based widths/margins/paddings. So we're not worried about anything related to vertical distance, like height, margin-top, margin-bottom, padding-top or padding-bottom. And we're not worried about any value of 0.
We will come across auto for the left and right margin in the wrapper rule set:
.wrapper { max-width: 960px; width: 90%; margin: 0 auto;}
This doesn't need to be converted into a percentage because auto automatically calculates the width based on the space available, so it's as good as a percentage.
We are worried about this margin property in the following declaration block:
.content-block .figure { float: left; margin: 30px; border: 15px solid #fff; ...
