Child theme broken after adding footer.php

I edited the footer.php file on my theme to change the format of the bottom section where copyright info appears.

I was able to successfully make the changes on my theme. However, to ensure that they would not be overwritten with updates, I went about adding the changes to my child theme.

I used SublimeText to make a footer.php file with the same code that had worked in my original theme. I used FTP to add the new footer.php to my child theme. This broke the formatting of my theme, distorting the layout in this way:

https://imgur.com/a/3Rdvf

I am very new to php, but thought that this was a simple enough task. Did I miss something essential? Could it have caused an issue to have duplicate php on my original theme and child theme?

site: https://www.danvineberg.com