Hi Raffaele,

One approach to implementing your use case is as follows: 

1) To apply a CSS style to all the text in the DataGrid (excluding col header text):

CSS:

.wj-cells .wj-cell {
  color: red;
}

2)  To apply a CSS class to a specific column:

• Define a custom style class.
• Use JavaScript in the Grid OnInitialize event handler flow - to apply the custom style class to a specific column by index.

//CSS Class:
.wj-col-bgcolor {
  background: yellow !important;
}


//JS
var gridProvider = GridAPI.GridManager.GetGridById($parameters.GridWidgetId)._provider;
gridProvider._cols[0].cssClass = "wj-col-bgcolor";

Alternative approach: https://www.outsystems.com/forums/discussion/70022/how-to-add-class-to-column-on-initialize/#Post282548

I hope this helps you!

Kind regards,

Benjith Sam