Edit/remove background

[C-BERBER]

How does one change color behind the edit/remove button or what is the css tag used? Also I am trying to use the condensed row and that thing is expanding the row... Thanks

                editing: {
               
                    enabled: true,
                    column: {
                        classes: '',  
                        style: { backgroundColor: 'blue' },
                        name: 'editing',
                        title: 'Actions',
                        filterable: false,
                        sortable: false
                    },
                    addText: 'Add',
                    editText: 'Edit',
                    deleteText: 'Del',