CSS Patterns

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CSS Checkbox Taskboard

http://codepen.io/ashlewis/pen/FAGvp

CSS Hover Tabs

http://codepen.io/mattboldt/pen/pwsxe

CSS Accordion

http://codepen.io/ApplePieNIceCreamDesigns/pen/hEHsy

CSS Tabs

http://codepen.io/ApplePieNIceCreamDesigns/pen/LtKCF

CSS Border Radius

http://css3pie.com/demos/border-radius/