Why the ad codes do not work in the header.php

can you post a link to your site to illustrate the problem?

https://buddygalaxy.com/blogs/
Thanks!

could be a z-index problem;

try to work witha tool such as Firefox’ add-on Firebug https://getfirebug.com/ to investigate the styles.

I don’t think this is caused by WordPress.

Thank you for your prompt reply! But, I still can’t find out. Anyway, the problem is I wanted to put an ad outside the wrapper on both sides, which I don’t know how?