updated style

src/main/java/ch/zhaw/gartenverwaltung/MyGardenController.java

@@ -117,6 +117,9 @@ public class MyGardenController {
 
         Button details = new Button();
         Button delete = new Button();
+        details.getStyleClass().add("button-class");
+        delete.getStyleClass().add("button-class");
+
         setIconToButton(details, "detailsIcon.png");
         setIconToButton(delete, "deleteIcon.png");
         details.setOnAction(getGoToCropDetailEvent(crop));
@@ -186,6 +189,12 @@ public class MyGardenController {
         Plant plant = plantList.getPlantById(Settings.getInstance().getCurrentHardinessZone(), crop.getPlantId()).get();
         Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
         alert.setTitle("Delete " + plant.name());
+        DialogPane dialogPane = alert.getDialogPane();
+
+        dialogPane.getStylesheets().add(
+                Objects.requireNonNull(getClass().getResource("bootstrap/dialogStyle.css")).toExternalForm());
+        dialogPane.getStyleClass().add("myDialog");
+
         alert.setHeaderText("Are you sure want to delete this Crop?");
         alert.setContentText("Deleting this crop will remove all associated tasks from your schedule.");