How to change the size of the thumbnails in the Top Posts widget

The Top Posts widget offers different options to display a list of posts, or a grid of post thumbnails. In some cases, you might want to change the size of the thumbnails used by this widget.

To do so, you’ll need to change the size parameters in the image source, by adding the following code to your theme’s functions.php file, or to a functionality plugin:

function jeherve_custom_thumb_size( $get_image_options ) {
        $get_image_options['avatar_size'] = 600;

        return $get_image_options;
}
add_filter( 'jetpack_top_posts_widget_image_options', 'jeherve_custom_thumb_size' );

You can add some custom CSS to overwrite Jetpack’s default CSS. You can paste this CSS in yor theme’s stylesheet, or under Appearance > Edit CSS in your dashboard:

.widget_top-posts .widgets-list-layout-blavatar {
    max-width: 600px;
}