added functions to child theme site gone blank

could you post the entire content of your child theme functions.php?
Using pastebin.com and then reporting here the link?
Thank you

This is not the right way to have a child theme functions.php eheh.
This is the functions.php of the main theme customizr.
Are you sure you pasted the right content?
If you’re sure then you need to know that a customizr child theme functions.php is, if you don’t add anything, something like:

<?php

stop.
http://www.themesandco.com/customizr/how-to-customize-customizr-wordpress-theme/