glightbox issue with inverted color_reg

[gurunanda7]

Hi

I am guru and I am working on creating a portfolio website for me . To show my concepts , I applied the glightbox method as shown in a video https://www.youtube.com/watch?v=UDH--wrJ5eA . Unfortunately, at first it didn't work but I managed to find a error and corrected it . But it was not perfect, after clicking the image , image should popup like this

(I copied the exact code and pasted it new file it works! ) but not on original file
but the output is like this with inverted colors in the original file :

Please help me in resolving the issue.

Thanks

[gingerchew]

Without the code you're using, it would be hard to see where the issue. Can you provide the code in a CodePen or repo?