Override them using the same technique you used to make the DIV's background color red. Web developers usually keep all CSS code in a document's style section or in external style sheets.

The CSS Filter Effects specification, which is backed by Adobe, defines a mechanism for applying common graphical filters to Web content. It can be used to adjust brightness, saturation, hue, and ...

CSS Animations is one of the enhancements to CSS proposed by the WebKit project that weve been calling CSS Effects (eg. gradients, masks, transitions).