simple css not working on individual pages

I’m trying to add a different background to my landing page using your Simple CSS plugin. The problem is, it’s not working anymore. It worked for a day or two when I used this code:

body {
background-image: url(http://cloverkate.com/wp-content/uploads/2016/07/ivy2.jpg);
background-repeat: no-repeat;
background-size: contain;
background-position: left top;
}

but somehow it reset and now nothing works. It works if I use the developer tools on my live site, so I know it’s not the code. I’ve also tried setting the backgrounds in the gp customizer then using this code on all the other pages:

body {
background-image: none;
}

but again, it’s not working. I would really appreciate your help!