#display:flexの使い方
https://www.webcreatorbox.com/tech/css-flexbox-cheat-sheet
#ニューモフィズムデザインのCSSガイド
https://neumorphism.io
#CSSで要素を上下や左右から中央寄せする7つの方法
https://www.granfairs.com/blog/staff/centering-by-css
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