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+++ b/article/seconds.md
@@ -9,6 +9,7 @@
 ## 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）