回答編集履歴
1
読みやすく修正。
answer
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@@ -38,6 +38,9 @@
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}
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```**動くサンプル：**[https://jsfiddle.net/12u0tzoh/1/](https://jsfiddle.net/12u0tzoh/1/)
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---
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【CSS アニメーション - CSS | MDN】
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[https://developer.mozilla.org/ja/docs/Web/CSS/CSS_Animations/Using_CSS_animations](https://developer.mozilla.org/ja/docs/Web/CSS/CSS_Animations/Using_CSS_animations)
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