Fix/body overflow #1366
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Fix/body overflow #1366
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close #1365
原因是 rax-modal 的原理是设置一个 fixed 的蒙层，并且设置 body 为 overflow hidden，在 web 下， body 上的 overflow 会被代理到 html 上面以使其 overflow hidden 无法继续 scroll。
https://drafts.csswg.org/css-overflow-3/#overflow-propagation