.textOnly ul.buttons > li.calloutItem a {
    padding: 15px;
    background: rgba(0,0,0,.45);
    display: block;
}
.textOnly ul.buttons > li.calloutItem a:hover {
    box-shadow: inset 0 0  500px 500px rgba(0,0,0,.5);
}
.textOnly span.text {
    color: #fff;
}