Anyone know why?
Here's the JS:
$(".screenshots .tab1").hover(function() {
    $(".section1").addClass("test");
        }, function() {
    $(".section1").removeClass("test");
        });
    });
And the CSS:
.test {
    background: black;
    border: 1px solid #ffb75b;
    background-color: #fffadb;
    }