Got the drag thingto work

src/assets/style/nav.css

@@ -3,11 +3,14 @@
     -fx-background-radius: 0;
 }
 #exit:hover{
-    -fx-background-color: rgba(0, 0, 255, 0.5);
-
+    -fx-border-radius: 12px;
+    -fx-background-color: cadetblue;
 }
 #Pane {
     -fx-border-width: 1px;
     -fx-border-color: black;
     -fx-border-style: solid;
+}
+#hyperlink {
+    
 }

src/sample/Main.java

@@ -23,6 +23,7 @@ public class Main extends Application {
         primaryStage.setTitle("Team-Avion Launcher [WIP]");
         primaryStage.setScene(new Scene(root, 900, 500));
         primaryStage.show();
+
         primaryStage.maximizedProperty().addListener((observable, oldValue, newValue) -> {
             if (newValue) {
                 primaryStage.setMaximized(false);
@@ -45,10 +46,7 @@ public class Main extends Application {
                 primaryStage.setY(event.getScreenY() - yOffset);
             }
         });
-
     }
-
-
     public static void main(String[] args) {
         launch(args);
     }

src/sample/sample.fxml

@@ -9,15 +9,15 @@
 
 <Pane id="Pane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="500" prefWidth="900" xmlns="http://javafx.com/javafx/8.0.112-ea" xmlns:fx="http://javafx.com/fxml/1">
    <children>
-      <Rectangle id="rectangle" arcHeight="5.0" arcWidth="5.0" fill="white" height="50.0" stroke="white" strokeType="INSIDE" width="900.0" />
+      <Rectangle id="rectangle" arcHeight="5.0" arcWidth="5.0" fill="white" height="50.0" strokeType="INSIDE" width="900.0" />
       <Button id="exit" alignment="TOP_RIGHT" contentDisplay="RIGHT" layoutX="862.0" layoutY="13.0" mnemonicParsing="false" stylesheets="@../assets/style/nav.css" text="X" />
       <Label layoutX="46.0" layoutY="11.0" text="Team Avion Launcher">
          <font>
             <Font name="Centaur" size="24.0" />
          </font>
       </Label>
-      <Rectangle arcHeight="5.0" arcWidth="5.0" fill="#e4e4e4" height="450.0" layoutX="-1.0" layoutY="50.0" stroke="TRANSPARENT" strokeType="INSIDE" width="145.0" />
-      <Hyperlink layoutX="26.0" layoutY="66.0" text="Our Modpacks" />
+      <Rectangle arcHeight="5.0" arcWidth="5.0" fill="#e4e4e4" height="450.0" layoutX="-1.0" layoutY="50.0" strokeType="INSIDE" width="145.0" />
+      <Hyperlink id="hyperlink" layoutX="26.0" layoutY="66.0" text="Our Modpacks" />
       <Hyperlink layoutX="26.0" layoutY="102.0" text="Settings" />
    </children>
 </Pane>