5.5: Datepicker Themes example
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**Primary Actor**: User

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

**Goal**: Show user different themes and styles for Datepicker

Main success scenario:
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1. User opens Datepicker demo page
2. User clicks on Themes sub-menu
3. User see select field (with "green" by default), Datepicker input and button "Open"
4. When user clicks on "Open" button, bs-datepicker theme-green opened with appropriate styles
5. When user chose "default", bs-datepicker theme-default shown with appropriate styles
6. When user chose "blue", bs-datepicker theme-blue shown with appropriate styles
7. When user chose "dark-blue", bs-datepicker theme-dark-blue shown with appropriate styles
8. When user chose "red", bs-datepicker theme-red shown with appropriate styles
9. When user chose "orange", bs-datepicker theme-orange shown with appropriate styles


Variations:
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2*. User scroll to Themes sub-menu