Fixes #46. Correct the z-index for iOS version.
Fixes #46.
Correct the z-index for iOS version.

driannaude/ngSticky,driannaude/ngSticky,d-oliveros/ngSticky,josephtan/ngSticky,enkodellc/ngSticky,EnigmaticCode/ngSticky,chrismbarr/ngSticky,plantwebdesign/ngSticky,westonganger/ngSticky,westonganger/ngSticky,tarosky/ngSticky,pre/ngSticky,d-oliveros/ngSticky,chrismbarr/ngSticky