private void staff_btn_Click(object sender, EventArgs e)
        {
            hover_panel.Height = staff_btn.Height;
            hover_panel.Top    = staff_btn.Top;
            staff_sign_in obj9 = new staff_sign_in();

            obj9.Show();
        }
        private void staff_btn_Click_1(object sender, EventArgs e)
        {
            hover.Height = staff_btn.Height;
            hover.Top    = staff_btn.Top;
            staff_sign_in obj2 = new staff_sign_in();

            obj2.Show();
        }