Remove Page Headings

I have the following code commented out in the page.php file. The pages headings are still showing.
What do I need to do to prevent page heading from printing... Thanks

<!-- <?php if (have_posts()) while (have_posts()) : the_post(); ?> -->
<!-- <?php if (is_front_page()) { ?> -->
<!-- <h2> -->
<!-- <?php the_title(); ?> -->
<!-- </h2> -->
<!-- <?php } else { ?> -->
<!-- <h1> -->
<!-- <?php the_title(); ?> -->
<!-- </h1> -->
<!-- <?php } ?> -->

 

Hello,

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.sl {
display: none;
}
.content-wrapper h2{
display: none;
}