XF 1.2 Category Strip Background

Hello All,
I am hopeful that someone here may be able to help me. I am hoping to have a different image in the background of each of my category strips.

I have done a search and found information from @Shelley in which states:

fieldset .nodeList.sectionMain .node.category.level_1.node_10 .categoryText {
    background: url("@imagePath/xenforo/gradients/10.png") no-repeat scroll right center transparent;
    height: 40px;
Which I know used to work on the sites, as I used it many times before however all of a sudden on xF 1.2 adding this to my extra.css template doesn't seem to work.

IS there anyone able to shed some light on this and hopefully help me out getting it working?

Your assistance would be greatly appreciated.

EDIT: Would you believe after an hour of playing immediately after typing this message I found that if you remove fieldset from the above code it works.

So therefore no longer need help. Thanks anyway.