This article was written for Page Builder Sandwich 5 or earlier. Page Builder Sandwich 6 is a new block builder, so some steps and screens here may differ. Getting started with version 6
pbs_iframe_header
Used within the iframe used by PBS to render its responsive view during editing. This is called right before the <head> tag closes and can be used to add scripts and styles.
Parameters
None.
Example
add_action( 'pbs_iframe_header', 'change_bg_color' );
function change_bg_color() {
?>
<style>
body {
background-color: hotpink;
}
</style>
<?php
}