Holo Web is a CSS library that attempts to imitate the Android “Holo” themes with CSS. Simply adding the stylesheets will instantly Holo-theme any site. With a few tweaks, the site can also add more Android-like UI elements, such as Holo-themed action bars.
Developed by Zachary Yaro.
Find out more about Holo Web on GitHub.
Following Google's replacement of Holo design on Android with Material Design, active development of Holo Web has ceased. You may wish to try its spiritual successor, MaterialZ.