Change background color of one page - Flatiron

Site URL: https://www.joelmcdowell.co/music-1

I am looking to change the background color of one page using CSS injection with no luck.

https://www.joelmcdowell.co/music-1

Can anyone help with what code to use.

I'm looking for an answer to this question as well, but without access to the advanced code injection setting on each page.  I tried inputting 

.collection-type-index #MYSECTIONNAME
{background-color:#eeeeee;}

in the Design > Custon CSS section with no luck.

Are you using 7.0 or 7.1? Please post a link to your site.