完善代码片段

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strick
2021-02-19 12:04:32 +08:00
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## JavaScript Algorithms
## CSS
#### 1)动画
## CSS 居中
1. [Flexbox](https://www.30secondsofcode.org/css/s/flexbox-centering)(使用 Flexbox 将子元素在父元素中水平和垂直居中)