Board Thread:Support Requests - Designing Your Wiki/@comment-1628881-20200716143404/@comment-1628881-20200716181544

I think this is something related with the URL.

https://vignette.wikia.nocookie.net/sinoalice/images/3/3b/Fondo_cabecera.png/revision/latest?cb=20200705150025&path-prefix=es

https://vignette.wikia.nocookie.net/sinoalice/images/3/3b/Fondo_cabecera.png/revision/latest?cb=20200705150025&path-prefix=es

Your URL doesn't work for me either, but the extended one, which is the one used by the CSS, works fine.