Update README.md

README.md

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 #IMPORTANT!
 If your page body requires `height: 100%`, your page will scroll to the top([#20](https://github.com/VodkaBears/Remodal/issues/20), [#21](https://github.com/VodkaBears/Remodal/issues/21)), because remodal sets `overflow: hidden` to the html and body when opening to hide a scrollbar. There is no problem if your content doesn't overflow your full height body container, otherwise you should do something of this:
 * Try to set `min-height: 100%` instead of `height: 100%`. If it doesn't help, read next.
-* Set `html, body { overflow: auto !important }`. Your page won't be locked and will be scrollable always.
+* Set `html, body { overflow: auto !important }` or remove overflow property of the `remodal_lock` class in the CSS file. Your page won't be locked and will be scrollable always.
 
 ## Notes
 * All modern browsers are supported.