Modify the size of the Gravatar in the author box
<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.
//* Modify the size of the Gravatar in the author box
add_filter( 'genesis_author_box_gravatar_size', 'mobile_first_author_box_gravatar' );
function mobile_first_author_box_gravatar( $size ) {
return 160;
}