Animated CSS3 Notifications Bar

The experiment for today is a lightweight and responsive JavaScript-less solution that can be used for displaying important information on the top of a website, purely CSS3-driven and fully customizable in terms of colors, fonts, sizes and default state (expanded or collapsed):


The CSS3 Hello Bar works with all modern browsers plus IE9+ (excluding transitions). Older browsers that do not understand the :root element of CSS3 will not display the bar, which is a good trade-off considering their small market share.

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