styles target fieldGroup in DateTimepicker

[paigeflourin]

Can we target the fieldGroup in the DateTimePicker component to style the border color?

 <DatePicker
                    firstDayOfWeek={1}
                    value={this.state.value}
                    formatDate={onFormatDate}
                    onSelectDate={this.handleDateChange.bind(this)}
                    styles={{    
                      
                        fieldGroup: {
                            border: '1px solid #D5D2D2'
                        }

                       
                    }}
                />   

I tried this one but its giving me error that fieldGroup does not exist. But when I checked the rendered HTML it does have fieldGroup inside the textField.