Did not work with drop shadow in this case

[aatmprakash]

When I use drop shadow it just fade like this- filter: drop-shadow(-2px 1px 11px black);

and when I use box-shadow I fell like this-

if I am doing something Wrong please help me and let me know .
this is the site where I am testing this library (Customui.codes)

[PavelLaptev]

@aatmprakash I'll check it