import javax.swing.*;
import java.awt.*;

public class MainAcceuil {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Acceuil");
    	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setUndecorated(true); //https://waytolearnx.com/2020/05/changer-la-bordure-dune-jframe-java.html

        frame.setSize(278,183);
    	frame.setLocation(500,250);
    	frame.setVisible(true);
    }
}