Board Made of Rectangles

I don't know if this is the right way to do this but I seems looks like
a good idea.

app/build.gradle

@@ -9,6 +9,7 @@
 plugins {
     // Apply the application plugin to add support for building a CLI application in Java.
     id 'application'
+    id 'org.openjfx.javafxplugin' version '0.0.13'
 }
 
 repositories {
@@ -29,6 +30,11 @@ application {
     mainClass = 'jchess.App'
 }
 
+javafx {
+    version = "20"
+    modules = [ 'javafx.controls']
+}
+
 tasks.named('test') {
     // Use JUnit Platform for unit tests.
     useJUnitPlatform()