7.7: Modals service examples custom css class
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**Primary Actor**: User 
 
**Scope**: Ngx-bootstrap DEMO / BS version 3&4 

**Goal**: Show user custom css class functionality

Main success scenario:
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1. User opens "Modals" demo page
2. User clicks on "Сustom css class"  sub-menu
3. When user clicks on "Open modal with custom css class" button, modal popup is opened with custom class
4. When user closes modal popup by the cross, modal popup is closed

Variations:
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2*. User scrolls to "Custom css class"