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OCLC Support

Why is CONTENTdm showing only part of my PDF and filling the rest of the screen with just black ?

  • When viewing PDF files in the expanded view in CONTENTdm part of the file is covered up with a black box instead of showing the PDF
Applies to

This can happen due to a custom CSS file you are using with that collection. Rules that limit iframe display can force this to happen.  Look for something similar to the following:

.preview iframe {
  height: 50vh;

If you can't find something similar to this in your CSS files, please contact OCLC Support with your CONTENTdm site domain, your name and a sample record.

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