URL: http://www.resa.be/client/releve-d-index/

Browser / Version: Firefox 64.0
Operating System: Linux
Tested Another Browser: Yes

Problem type: Site is not usable
Description: Impossible to see "EAN" digits
Steps to Reproduce:
The first 4 readonly digits should be visible ("5", "4", "1", "4") but they aren't. Then if you try to introduce in non-readonly fields you won't see them too, which make the form unusable. (No problem with Chromium 69.0.3497.92 on Linux)

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