1.9: Alerts Component level 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 in component level

Main success scenario:
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1. User open Alerts demo page
2. User click on Component level styling sub-menu
3. User see 1 alert with specific style, which differs from default
4. Src of component should contain this style
5. Alert template should not contain this style

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