How to draw on the webBrowser using c#?

Hi everyone,
I am a beginner of C#.
I am currently working on a simple project that requires to create a web browser a do some simple graphics on it.

I have finished the web browser part and I cannot do graphics on it.

I tried to draw a rectangle with the function Form1_paint.
The rectangle is drawn on the back of the browser, but I want it to be in front of it .
I have no idea what to do. Sorry I am really new to C# and please help me.

Here below is my code,

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            this.DoubleBuffered = true;
            this.Paint += new PaintEventHandler(Form1_Paint);
            webBrowser1.GoHome();
        }
        private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            e.Graphics.DrawRectangle(Pens.Black, new Rectangle(0, 0, 200, 200));
        }
        private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {            
        }
        private void goButton_Click(object sender, EventArgs e)
        {
            webBrowser1.Navigate(textBox1.Text);
        }
        private void navigateToolStripMenuItem_Click(object sender, EventArgs e)
        {
        }
        private void homeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            webBrowser1.GoHome();
        }
        private void goForwardToolStripMenuItem_Click(object sender, EventArgs e)
        {
            webBrowser1.GoForward();
        }
        private void goBackToolStripMenuItem_Click(object sender, EventArgs e)
        {
            webBrowser1.GoBack();
        }
        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            this.Refresh();
        }
    }
}