The Dark Theme is one of the four themes supplied with ag-Grid.
To use a theme, add the theme class name to the div element where the ag-Grid directive is attached.
The following is an example of using the ag-dark theme:
<div ag-grid="gridOptions" class="ag-dark"></div>
Dark Theme Example
This grouped example demonstrates some of the different facets of a theme - full, part and no checkbox selection for example, as well as general look and feel