7.4: Modals service examples scrolling long content
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**Primary Actor**: User  

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

**Goal**: Show user modal scrolling long content  functionality

Main success scenario:
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1. User opens Modals demo page
2. User clicks on Scrolling long content  sub-menu
3. When user clicks on "Open modal" button, modal popup is opened, backdrop is enabled
4. When user scroll content by mousewheel, content is scrolled successfully
5. When user closes modal popup by click on the cross, modal popup is closed and backdrop is disabled

Variations:
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2*. User scrolls to Scrolling long content 
4*. When user scroll content by up/down, content is scrolled successfully
4**. When user scroll content by PgUp/PgDn, content is scrolled successfully