Avatar class for front page and profile page

Hi;

User avatar displayed at front page and on top of profile cover page use same CSS:
#main img.avatar { ..... }

how can I use a separate CSS class for the profile avatar? I checked the cover.php file and find the code lines to display the uploaded user cover page with the uploaded user avatar but I don’t see a way to modify or add a class that will allow me to show the avatar a bit differently.

<div id="header-cover-image" <?php if ( $display_cover_image && $cover_image ) : ?>style="background-image: url(<?php echo esc_url( $cover_image ); ?>);"<?php endif; ?>>
	<?php if ( $display_avatar ) : ?>
		<div id="header-avatar-container">
			<a>user ) ); ?>">
                            <?php echo get_avatar( $data->user->ID, 128, ); ?>
			</a>
		</div>
	<?php endif; ?>
</div>

Any suggestions?

Thank you much.

Lode

The page I need help with: [log in to see the link]