css - Why Bootstrap's class navbar-fixed-top z-index=1030? -


in coding, see class navbar-fixed-top in bootstrap v3.3.7. why z-index = 1030?

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the purpose of using z-index move content in z-axis. since using navbar-fixed-top class, header stick top of page. scrolling page down hide header. in order scroll page content below header, z-index used.


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