Custom theme covering up admin toolbar. I am trying to convert a template to a custom drupal 8 theme and am having trouble with it covering the admin toolbar when logged in. I tried to inspect bootstrap when installed to see what was added but to no avail.  I am trying to create a custom theme from scratch and not a subtheme.  Any help is appreciated to find out what css that I can add that will push the content down while logged in? 

Thanks
Drupal 8 admin toolbar z-index value is 502 only, but the bootstrap default static navbar z-index value is 1000, I think, Increase the admin toolbar z-index value would fix the issue,

.toolbar-oriented .toolbar-bar {
 z-index: 1001 /* or more */
}


Place that code in your theme's custom css file :)