Hi Dennis,
The easiest way to do this at the moment is to put server/Pages/_Host.cshtml in application ignore list
and add simple CSS rule to style DataGrid cells:
<head>
...
<style type="text/css">
.ui-datatable td
{
padding: 0px;
}
</style>
</head>
The result will be:
We will improve CSS customization in the future to work without ignoring any pages.
Best Regards,
Vladimir

