This is a clone of issue OCPBUGS-33523. The following is the description of the original issue:
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With the change from PatternFly's `PageHeader` to `Masthead`, there is no longer a max-height of 60px restricting the size of the masthead logo.  As a result, logos that are larger than 60px high display at their native size and cause the masthead to get taller (see https://drive.google.com/file/d/11enMtMU1cfzXQqRfd0eTdsKFkBVPWoFc/view?usp=sharing).  This went unnoticed in the change because OpenShift and OKD logos are sized appropriately for the masthead and do not need the restriction.  Further, the docs state a custom logo "is constrained to a max-width of 200px and a max-height` of 68px.", which is a separate bug that needs to be addressed (should read "is constrained to a max-height of 60px").