1.8: Alerts Global styling example
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**Primary Actor**: User

**Scope**: Ngx-bootstrap DEMO / BS version 3&4

**Goal**: Show user how to change alert style globally

Main success scenario:
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1. User open Alerts demo page
2. User click on Global styling sub-menu
3. User see 1 alert with specific style, which differs from default
4. Alert template should contain this style

Variations:
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2*. User scroll to Global styling sub-menu