Using the same color but the result is different

Hi embed a script but adjusted the color to be the same as the background, however it appears differently.

Any idea why & how it can be fixed?

Here is my site Read-Only: [LINK]1
(how to share your site Read-Only link)

Here is the custom code
eventhough using 1F262A in both custom code and webflow the result is different

Similarly with Lottie files
in the preview mode it works

but when I publish is different

if anbody have any idea why it isn’t match, would be appreciated