Card与Affix混合使用当Affix进行定位后，Affix的DOM元素hover时会被隐藏不可见

[wonyun]

Environment(required)

• antd version: 2.5.2
• OS and its version: mac
• Browser and its version: chrome 55.0.2883.95 (64-bit)

What did you do? Please provide steps to re-produce your problem.

Card与Affix混合使用时，Affix作为Card的子元素，当达到指定条件Affix定位后，鼠标hover到Affix的dom元素上，其dom元素不可见

What do you expected?

affix的内容可见

What happen?

Re-producible online demo

事例：https://codepen.io/fetest/pen/jyvpbB?editors=0010

[RaoHai]

看了一下 DEMO ，怎么操作能重现 “其dom元素不可见”，感觉挺正常。。

[afc163]

缩小垂直视窗，向下滚动。

[RaoHai]

。。居然只能在 retina 屏上复现。。

[RaoHai]

感觉好像是 chrome 的 bug ？

https://github.com/ant-design/ant-design/blame/master/components/card/style/index.less#L16

这个 z-index:1 的影响，去了就好了。 firefox，safari，和 chrome 在非 retina 屏下都无法复现。。。 @afc163

[afc163]

蛋疼。先去掉好了。

[wonyun]

@afc163 @RaoHai 👍👍👍

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