Add decorations in JButton-CodePudding

I am currently doing GUI development in JavaSwing. I am trying to create a button like the HTML code described below using JButton, which was added to getContentPane(), but I don't know how to do it and am at a loss.

Current Code:

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

public class Main {
  public static void main(String[] args) {

    JFrame frame = new JFrame();
    frame.setTitle("TITLE");
    frame.setVisible(true);
    frame.setLocationRelativeTo(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(1000, 800);
    frame.getContentPane().setLayout(new FlowLayout());

    JButton button = new JButton("Click Here");
    frame.getContentPane().add(button);
    button.setBackground(Color.RED);
    button.setForeground(Color.WHITE);
    button.setOpaque(true);
    button.setPreferredSize(new Dimension(150, 50));

    }

  }

The entity I am trying to create is a little hard to explain by mouth, so I have tried to reproduce what I am trying to create using HTML. It is as follows:

HTML CODE:

<div >Click Here</div>

<style>
.btn {
  background-color: red;
  display: inline-block;
  height: 70px;
  width: 150px;
  text-align: center;
  color: white;
  padding-top: 35px;
  font-size: 25px;
  border-radius: 50px;
  box-shadow: 0px 5px #b70d0b;
  opacity: 0.7;
  cursor: pointer;
}
  .btn:hover {
    opacity: 1;
  }
  .btn:active{
    position: relative;
    top: 5px;
    box-shadow: none;
  }
</style>

This is what it looks like when executed: The following image is my ideal in JavaSwing.

The question this time is:

Setting opacity to JButton in JavaSwing
To set border-radius to button
To set opacity to 1 only when the mouse hovers over the button and MouseEvent detects it.
Set box-shadow to 5px, and use ActionListener to detect the interval of active, and make it look like a button is being pressed.
To reproduce the cursor:pointer code while the mouse is hovering over the button.

I am not sure if this is too much to ask or not. I am fully aware that there are too many questions, so I would appreciate it if you could answer only the ones that I can answer.

In the meantime, I have done my own Google research on the question, but none of it fits my ideal, so I am asking it here.

As for what I did, here's what I did:

I looked

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.RenderingHints;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class Main {
    public static void main(String[] args) {
        new Main();
    }

    public Main() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {
        public TestPane() {
            setBorder(new EmptyBorder(32, 32, 32, 32));
            setLayout(new GridBagLayout());
            FancyButton btn = new FancyButton();
            btn.setText("Click me");
            add(btn);
        }
    }

    public class FancyButton extends JButton {

        private int cornerRadius = 32;
        private BufferedImage backgroundImage;

        private float alpha = 0.25f;

        public FancyButton() {
            setBackground(Color.RED);
            setForeground(Color.WHITE);
            // This is important
            setBorderPainted(false);
            // This is important
            setContentAreaFilled(false);
            // This is important
            int padding = cornerRadius / 2;
            setBorder(new EmptyBorder(padding, padding, padding, padding));
            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseEntered(MouseEvent e) {
                    alpha = 1;
                    repaint();
                }

                @Override
                public void mouseExited(MouseEvent e) {
                    alpha = 0.25f;
                    repaint();
                }
            });
            addComponentListener(new ComponentAdapter() {
                @Override
                public void componentResized(ComponentEvent e) {
                    backgroundImage = null;
                }
            });
        }

        @Override
        public boolean isOpaque() {
            return false;
        }

        @Override
        public Insets getInsets() {
            Insets insets = super.getInsets(); 
            insets.bottom  = 5;
            return insets;
        }

        @Override
        public Insets getInsets(Insets insets) {
            super.getInsets(insets);
            insets.bottom  = 5;
            return insets;
        }

        @Override
        protected void paintComponent(Graphics g) {
            if (backgroundImage == null) {
                backgroundImage = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB);
                Graphics2D g2d = backgroundImage.createGraphics();
                g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2d.setColor(getBackground().darker());
                g2d.fillRoundRect(0, 5, getWidth(), getHeight() - 5, cornerRadius, cornerRadius);
                g2d.setColor(getBackground());
                g2d.fillRoundRect(0, 0, getWidth(), getHeight() - 5, cornerRadius, cornerRadius);
                g2d.dispose();
            }

            Graphics2D g2d = (Graphics2D) g.create();
            g2d.setComposite(AlphaComposite.SrcOver.derive(alpha));
            g2d.drawImage(backgroundImage, 0, 0, this);
            super.paintComponent(g2d);
            g2d.dispose();
        }
    }
}