css - HTML body is not at the top of the page even with margin set to 0 - Stack Overflow
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Box model
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How To Adjust the Content, Padding, Border, and Margins of an HTML Element With CSS | DigitalOcean
html - CSS - I make margin between layout's component but the space's color doesnot change to body color - Stack Overflow
How to Understand and Work With CSS Margins
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html - Why isn't this CSS margin 0 applied? - Stack Overflow
How to Understand and Work With CSS Margins
