You could change this line :
<a href="#" data-reveal-id="<?php echo $modalid ?>">
to :
<a href="https://wordpress.stackexchange.com/questions/279169/<?php echo get_permalink(); ?>">
You could change this line :
<a href="#" data-reveal-id="<?php echo $modalid ?>">
to :
<a href="https://wordpress.stackexchange.com/questions/279169/<?php echo get_permalink(); ?>">