Theming design spec: Sticky Elements

[evwilkin]

Define consistent styling for sticky elements when glass is enabled. 

• Sticky Page Header & Breadcrumbs
• Sticky Top & Bottom Pagination
• Sticky Table row headers 
• Sticky Toolbar

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Jira Issue: PF-3560

[evwilkin]

Closed via Jira sync - Jira issue PF-3560 is closed.