CSS lay-out met flexbox
CSS Gap Space with Flexbox
css - Removing extra spacing on a flexbox with wrapped children? - Stack Overflow
CSS】Flexboxプロパティ一覧！それぞれの使い方を解説 | ZeroPlus Media
Basic concepts of flexbox - CSS: Cascading Style Sheets | MDN
margin-bottom - CSS: Cascading Style Sheets | MDN
Wrapping text in flex-item? - HTML & CSS - SitePoint Forums | Web Development & Design Community
justify-content | CSS-Tricks - CSS-Tricks
CSS Flexbox #2. How to Use the justify-content Property - OSTraining
padding-bottom - CSS: Cascading Style Sheets | MDN
css: Flexbox - margin property
Tailwind CSS Flex Wrap - GeeksforGeeks
どっちを使う？CSSで横並びのコンテンツ（Float or Flex） | ｗ２ソリューション株式会社 TECH Media
Flexible padding for buttons, using flexbox – Terluin Webdesign
Flex-items With Collapsable Margin On Wrap
実機確認でよくある崩れとその対策（Safari、margin、flex など） – 東京のホームページ制作 / WEB制作会社 BRISK
CSS Gap Space with Flexbox
Flexを使用した間隔（マージン）をとった横並びレイアウトの指定方法まとめ【CSS初心者向け】｜WEB TIPS～ホームページ制作の覚え書き
flex-basis - CSS: Cascading Style Sheets | MDN
CSS Gap Space with Flexbox
CSS flex-wrap Property
html - Remove margin-right when flex-wrap is wraping elements with pure CSS - Stack Overflow
CSS Grid or Flexbox? How to pick between the two CSS layout systems
css - Flexbox: how to add margin / vertical spacing for the case there is more than one row? - Stack Overflow
Flexbox gutters and negative margins, mostly solved
Flexbox gutters and negative margins, mostly solved
