How to insert link, with lightbox, that opens specific page content only

if you load page with iframe , then whole header , footer all will display in iframe ,

you can do 1 thing , using css hide header , footer and sidebar like below :
replace “#secondary” with your sidebar div id.

<style>
header{ display:none;}
footer { display:none;}
#secondary{ display:none;}
</style>

it worked for me.
thanks