BTW, I personally feel you need to do this (input CSS into Custom CSS tab in options panel) for better usability ( I think that was your original idea too originally as posted in an earlier question) –
.type-portfolio .image-area .image-info h3 { display: none; }
This will help you avoid having to make the above code changes. And you can get rid of the hover color by doing this –
.type-portfolio .image-area .image-info { background: none; }