That images is the background of the div #content-area. You set this background in two different lines 214 and 648, so first you can simply delete the oine 214 which is unneeded.
Then, replace the background
The purpose of this video is to demonstrate how to reset a WordPress password if you are locked
out and cannot reset the password. A typical use would be if you cannot access the email to which
WordPress would send the password recovery email to…