kirss additional CSS

.rss_item, .rss_body {
        border: solid 1px #888;
}

.rss_body {
        height: 300px;
        overflow: auto;
}

.rss_channel .rss_item {
        display: none;
}

.rss_channel:hover .rss_item {
        display: block;
}

.rss_item + .rss_body {
        display: none;
}

.rss_item:hover + .rss_body {
        display: block; 
}

.rss_body:hover {
        display: block;
}