Trying to remove the page title box from the slider…

Hi, I'm trying to remove the page title and the box around it from the slider. I can get it to disappear in Google Chrome by changing the #feature-slider .entry-container to...

#feature-slider .entry-container {
    background: #4440;
    background: rgba(0,0,0,0);
    bottom: 0;
    display: none;
    left: 20%;
    padding: 20px;
    position: absolute;
    text-align: center;
    width: 60%;
    z-index: 101;
}

But when I add this to my child theme (that I created using the Catch plugin), the changes don't take effect - what am I doing wrong? Thanks, Darren