How can I alter image brightness using CSS code in Cabana theme?

[Michael_Xu]

I have question about changing the brightness of images using css code. However, when I enter the following css code: "filter: none;", the code is not allowed to be saved. Its original situation is shown here. The theme I use is Cabana (2.5.0).

[IGIT]

I also have this issue using Shopify's reference Dawn theme. The theme editor adjusts the brightness of the image correctly, but then refuses to save the CSS. Some "clever" parsing somewhere has been updated with this CSS directive?

[sgnature]

Hi, I have the same issue, adding a CSS code for brightness and then I cannot save. Did you manage to solve the problem? thanks