Hello everybody,
I've been a bloody problem for a few days now.
I created a button in LibGDX. This button I have packed on a table and the table I have packed on a stack and the stack again to a stage.
The problem is that I have to push a few pixels next to the button in order to erase.
That means when I press exactly on the button nothing happens.

I will copy here the times the appropriate code slightly shortened.
I could also shorten the code a bit.

public class HUD implements Disposable {
    PlayScreen screen;

    public static Stage stage;
    private Viewport viewport;

    private Stack stack;

    public HUD(PlayScreen screen, SpriteBatch sb) {
        this.screen = screen;

        viewport = new FitViewport(PlayScreen.V_WIDTH, PlayScreen.V_HEIGHT, new OrthographicCamera());
        stage = new Stage(viewport, sb);

        stack = new Stack(); // This is the Stack
        stack.setFillParent(true);
        stack.addActor(buildHudLayer()); // Here I add another Table to the Stack
        stack.addActor(buildButtonLayer()); // Here I add the Table with the Button to the Stack
        stage.addActor(stack); // Here I add the Stack to the Stage
        PlayScreen.multiplexer.addProcessor(stage); // Here I add the input of the Stage to an InputMultiplexer
        screen.setInput();
    }

    private Label fpsLabel;
    private Label levelLabel;

    private Table buildHudLayer() { // This is another table
        Table table = new Table();
        table.top();

        fpsLabel = new Label(Gdx.graphics.getFramesPerSecond() + "fps", new Label.LabelStyle(new BitmapFont(), Color.BLACK));
        levelLabel = new Label(Masterrunner.currentLevel + " - " + Masterrunner.currentLevel, new Label.LabelStyle(new BitmapFont(), Color.BLACK));

        table.add(fpsLabel).expandX();
        table.add(levelLabel).expandX();

        return table;
    }

    private Table buildButtonLayer() {
        Table table = new Table(); // Here I create the table
        table.setFillParent(true);
        table.setDebug(true);
        table.top();

        Button.ButtonStyle style = new Button.ButtonStyle(); // This is the Button
        style.up = new TextureRegionDrawable(PlayScreen.atlas.findRegion("Pause"));
        style.down = new TextureRegionDrawable(PlayScreen.atlas.findRegion("Pause1"));
        Button pauseButton = new Button(style);
        table.add(pauseButton).size(20, 20); // Here I add the Button to the Table

        return table; // Here I return the Table
    }

    public void update() {
        fpsLabel.setText(Gdx.graphics.getFramesPerSecond() + "fps");
        levelLabel.setText(Masterrunner.currentWorld.getName() + " - " + Masterrunner.currentLevel);
        stage.act();
	}

    public void render() {
        stage.draw();
    }
}

I hope the information is sufficient, if not corrected me please.

Dear greetings UbuLin ;D