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https://freefrontend.com/css-custom-property-variables-examples/
CSS: box-sizing
https://www.j-w-v.com/writing/index.php/css-s-undersung-property-box-sizing
CSS Buttons
http://www.bypeople.com/squishy-shadowed-css-buttons/
Best sites to learn coding
http://www.labnol.org/internet/learn-coding-online/28537/
