using cssClassNames options for a table does not work

[sleekmountaincat]

hello,

class names get applied to the element in question, but the css for that class is not applied. with the following, i would expect to see a border around the header TR.

`


<style include="spaces-iod-styles">
:host {
display: block;
padding: 10px;
}
google-chart {
height: 90vh;
width: 90vw;
}
.mac {
border: solid 2px red;
}
</style>

    <div class="chart-container">
        <google-chart type='table' options='{ "allowHtml": "true", "cssClassNames": {"headerRow": "mac"} }' data="[[ chartdata ]]"></google-chart>
    </div>

</template>`