Bolt Z-index
Utility Description
Add the utility class xx where xx equals the z index level you wish to apply.
For example: .modal
Demo
Z-Index: modal: 200
Utility Class: modal
Z-Index: modalBG: 180
Utility Class: modalBG
Z-Index: navFixed: 160
Utility Class: navFixed
Z-Index: tooltip: 140
Utility Class: tooltip
Z-Index: popover: 120
Utility Class: popover
Z-Index: fab: 110
Utility Class: fab
Z-Index: nav: 100
Utility Class: nav
Z-Index: contentTop: 80
Utility Class: contentTop
Z-Index: content: 60
Utility Class: content
Z-Index: contentBottom: 40
Utility Class: contentBottom
Z-Index: backgroundTop: 20
Utility Class: backgroundTop
Z-Index: background: 0
Utility Class: background
Z-Index: backgroundBottom: -20
Utility Class: backgroundBottom