I have a radar chart and  want to float gauges next to it:  When i inspect it looks like this:  

    <div id="chartJSContainer_3" style="height: 400px;"><iframe class="chartjs-hidden-iframe" tabindex="-1" style="display: block; overflow: hidden; border: 0px; margin: 0px; top: 0px; left: 0px; bottom: 0px; right: 0px; height: 100%; width: 100%; position: absolute; pointer-events: none; z-index: -1;"></iframe>
        <canvas id="chartJSCanvas_3" height="400" width="877" style="display: block; width: 877px; height: 400px;"></canvas>
    </div>

please can you tell me how to add a width property to the parent div of the iframe to set it to a width of 400pxs?  I hope this is not too dumb of a question.