Help changing Image

firebird55

Hey I'm trying to change this image: https://ca.classistatic.com/static/V/9414/img/placeholder-large.png on the website kijiji.

This is my current code:

img[src="https://ca.classistatic.com/static/V/9414/img/placeholder-large.png"] {
height: 0 !important;
width: 0 !important;
background: url(https://i.imgur.com/ySfuIWq.png) no-repeat !important;
padding-left: 200px !important;
padding-top: 160px !important;

}


It works for like a second but i still get the original image? Any help? Video of problem:

https://streamable.com/jo02e7