css3彈性盒子display：flex

css3的flexbox詳細介紹：https://css-tricks.com/snippets/css/a-guide-to-flexbox/ 原文鏈接：https://css-tricks.com/snippets/css/a-guide-to-flexbox/ 瀏覽器的支持情況： Chrome Safari Firefox Opera IE Edge Android iOS 21+ (new

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