CSS】Flexbox、flex-direction: column;とflex-grow: 1;を使ってボタンの位置を合わせる | 125naroom / デザインするところ（会社）です。
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How to Make Flexbox Vertical - Beginner CSS Flexbox Tutorial - YouTube
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Flex Cheatsheet
css - flexbox vertically split container in HALF - Stack Overflow
flexプロパティの実践的な使い方を徹底解説 | コリス
html - How can I make my flexbox layout take 100% vertical space? - Stack Overflow
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Digging Into the Flex Property - Ahmad Shadeed
Day 21: flex-grow | SamanthaMing.com
Aligning items in a flex container - CSS: Cascading Style Sheets | MDN
CSSのflexboxでflex-growやflex-shrink使用時の注意点 | iwb.jp
Build Smart CSS-only Layouts with Flexbox | Toptal
css - Stop flex element grow over max-height:max-content - Stack Overflow
CSS | flex-grow Property - GeeksforGeeks
Flex Grow CSS Property | Scaler Topics
