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CSS] marginとpaddingの使い分けに本気出してみた。が、borderもちゃんと考える。 - Qiita
Everything You Need To Know About CSS Margins — Smashing Magazine
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CSS基礎 マージン(margin)とパディング(padding)の使い方まとめ | Stronghold Archive
Six Questions to Understand the CSS Box Model | by Demba Siby | Launch School | Medium
Box model
Webデザイン基礎演習
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