How can I do the correct working of mouseEnter event with form?

Question

I have a method, like that:

private void Form1_MouseEnter(object sender, EventArgs e)
        {
            Form1 form1 = (Form1)sender;
            form1.Opacity = 1;
        }

private void Form1_MouseLeave(object sender, EventArgs e)
        {
            Form1 form1 = (Form1)sender;
            form1.Opacity = .5;
        }

But when my mouse enters other form elements like buttons and other, the second method fires and the first one becomes inactive

I want the first method to work even when hovering over buttons and other form elements and gets inactive only when the mouse leave the form

I tried to give all form elements a subscription to the mouse hover event, but obviously this did not help (I did it out of desperation)