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UPDATE:

I noticed that there is a unique ID for each Post List in the CSS, so this works great (yay!):

#wpsp-15686 .wp-show-posts-image {
    max-width: 200px;
    height: auto;
}

#wpsp-15699 .wp-show-posts-image {
    max-width: 200px;
    height: auto;
}

However, if I try and combine multiple IDs into one css selector, the output breaks:

#wpsp-15686, #wpsp-15699 .wp-show-posts-image {
    max-width: 200px;
    height: auto;
}

In the above code, what am I doing wrong?