import javax.swing.JPanel;
import java.awt.Dimension;
import java.awt.Color;
import javax.swing.border.LineBorder;

public class BlankArea extends JPanel {
    final Dimension mySize = new Dimension(100, 100);

    public BlankArea() {
        setBackground(new Color(0.98f, 0.97f, 0.85f));
        setBorder(new LineBorder(Color.green, 2));
    }

    public Dimension getPreferredSize() {
        return mySize;
    }

    public Dimension getMinimumSize() {
        return mySize;
    }
} // class BlankArea