<table class="tableChart">
                <tr>
                  <td>{{> chart chart_id=this.idChartMem}}</td>
                  <td>{{> chart chart_id=this.idChartCPU}}</td>
                </tr>
                <tr>
                  <td>{{> chart chart_id=this.idChartNet}}</td>
                  <td>{{> chart chart_id=this.idChartDisk}}</td>
                </tr>
              </table>

<meta name='viewport' content='width=device-width, minimum-scale=1, maximum-scale=1, user-scalable=no, initial-scale=1' />

@media only screen and (min-device-width: 240px) and (max-device-width:
768px) {

    .tableChart td {

        display: block;

    }

}