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蘑菇街线性渐变的动画如何实现

https://img.mukewang.com/5bda956a0001aab802660150.jpg

https://img1.mukewang.com/5bda95750001a47102800161.jpg

最近在模仿蘑菇街做练习
这种线性渐变的动画如何实现啊？用过keyframe，transition，都很生硬，也许是我用的不对？

ITMISS
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1回答

哔哔one

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