.is-expandable {
}

    .is-expandable .header {
        cursor: pointer;
        display: inline-block;
        padding-left: 152px;
        padding-top: 5px;
    }

    .is-expandable.is-collapsed .header:before {
        content: url(/images/expand-blue.png);
        margin: auto 3px auto 3px;
    }

    .is-expandable.is-expanded .header:before {
        content: url(/images/collapse-blue.png);
        margin: auto 3px auto 3px;
    }