Ajar Productions

With an in5 Pro-level or higher subscription, you can export a Viewer Display that includes page thumbnail navigation. These page thumbnails can be modified.

Make page thumbnails from variable page heights be the same height

When you create a document with variable page heights, these page thumbnails will be of different heights.

Default export of a scrolling document with variable page heights and page thumbnails in the Viewer Display	Export of the same scrolling document using CSS to constrain the page thumbnails' heights and widths to a maximum value

If you'd like to make them the same height, then you can add the following CSS via the Resources section of the Export HTML5 with in5 dialog (in5 > Export HTML5 with in5...) to change the size of the thumbnails where the max values can be adjusted as needed:

.viewer-page-thumb > img {
    max-height:276px;
    max-width:356px;
}