CSS box model - Wikipedia
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html - Flexbox, boxes inside boxes - Stack Overflow
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CSS Box model deals with the area that surrounds each elements and how it can be formatted.
CSS Box Model Explained - Humaneer
The box model - Learn web development | MDN
html - How to put two divs side by side - Stack Overflow
Layout: nested boxes - A Smarter Way To Learn HTML & CSS (2015)
The CSS Box Model: Explained for Beginners | Udacity
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visualforce - How do I get this HTML/CSS code to make two boxes on one page? - Salesforce Stack Exchange
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CSS Box Model Tutorial | HTML & CSS Is Hard
