As browser windows widen and narrow, the layout of an element adapts to maintain the same proportions, and so the whole page layout adapts. Readers can choose the window size they find appropriate to their needs. Margins, text indentation and other layout aspects can also be specified in relation to the size of the text they contain, using the em unit for specifying margins, text indentation and other layout aspects. So, when a user adjusts their font size to make a page more legible, the margin increases proportionally, and if they adjust it to make it smaller, the margin adapts again. Colors The web is by and large a more colorful medium than the printed page.
Color is cheaper on the web.
But color poses difficulties to accessibility as well. That is, regardless of any other ability, because warning information is almost invariably conveyed using red for danger and green for safety. It's a shame that warning lights aren't simply adaptable. It would be a shame, as in the near future most web browsers will provide simple ways for readers to adjust the color of elements on a web page, via user style sheets, which can override your style sheets. And avoid relying on color combinations to alone convey meaning.