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This CSS snippet will make your life so much easier | by Michael C. Brook | Medium
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![Box-Sizing: The Secret to Simple CSS Layouts [Article] | Treehouse Blog](https://3wga6448744j404mpt11pbx4-wpengine.netdna-ssl.com/wp-content/uploads/2014/06/box-sizing-illustration.png "Box-Sizing: The Secret to Simple CSS Layouts [Article] | Treehouse Blog")
Box-Sizing: The Secret to Simple CSS Layouts [Article] | Treehouse Blog
Add-ons have box-sizing: border-box by default?! - Development - Mozilla Discourse
CSS box-sizing Property - explained
