Interactive Book
In the CSS for the Interactive Book, the class '.h5p-interactive-book-cover-title' specifies the text size of the title to be '2.188em'. However, inherited from the div, the CSS classes ".html.h5p-iframe .h5p-content" specify the line height to be '1.5em'. So, if the title is long enough to wrap, the two lines of text overlap each other. This is a problem, especially since this content is displayed through an iframe so CSS in the page it is displayed on cannot correct the issue.