In the following I will explain my volume display code, which seems to be misunderstood by some editors, who just keep destroying it. First: Its advantage is, that it displays more than one volume per line and breaks those two volumes up and puts them above/underneath each other. Second, if the resolution gets too small for them to be displayed next to each other. To see the code and commentary, please click here.
Comparison of a page w/o (above) and w/ (bottom) the code on 1080p. Please keep in mind that the gap between the chapters and the cover as well as the separation line are configurable/optional.