There is a bug in this version of the Chrome browser on MacOS that causes ALL pdfs to go white after a second. I doubt it has to to with webflow. The easiest work around if this is the case is to go to another tab and then back, but even this was so annoying that I downloaded and installed the prior version of Chrome until they fix the pdf bug. Supposedly, Google knows about this bug, but it’s unclear how high a priority it is for them. Someone also reported that reloading the pdf using command-R also restores the pdf. If these things work for you then it’s definitely not related to Webflow.