These days, CSS can do much more than style fonts and add borders around elements. For example, you can apply colour, brightness and other tweaks to images, live, without having to resort to a photo editor.
As with all browser-based effects, it does come with a few caveats, which you should keep in mind depending on what systems you want to support:
Unfortunately, IE & Edge browsers, as well as Opera Mini do not support filters and blend modes. Safari (desktop & IOS ) does not support the hue, saturation, color, and luminosity blend modes, but this should not affect the CSSCO filters much, if at all.
CSSSO [Official site]