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Looking at Las Vegas signs from the 1950’s put me in mind to create a sparkly lighting effect for web page text. This version is derived from my TV static article, with which it shares some code.

Using cover and contain values for the background-size property makes it easy to create background images that cover the complete browser window, but for a very long time web developers didn’t have control over much else: smaller tiled images repeated infinitely in backgrounds, with no control over how they started or finished.

By default, background images tile both vertically and horizontally; CSS provided the opportunity to constrain this to one axis with background-repeat: repeat-x or background-repeat: repeat-y, but that’s as far as it went. What designers needed was “flexbox for backgrounds”: the ability to evenly distribute tiled images.

With the release of Firefox 49, that feature is now available in every major browser, in the form of round and space values.