z-index needs to be less than the close button to avoid hiding it #1872
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Changes
The header is further down in the DOM than the close button and they have matching z-index values so the header is overlaying the close button
https://github.com/auth0/lock/blob/master/css/index.styl#L178
https://github.com/auth0/lock/blob/master/css/index.styl#L204
close button z-index should be > header z-index
References
fixes #1863
Testing
Also tested in IE11
Checklist