I am not sure what I am missing, but looks like my in-line styling is not recognized by highchart gauge.
The gauge looks extremely big (600X400). it is supposed to be max-width:277 and height:240px with my css.
<libre ng-if="statCtrl.device" title="'Temperature'" sensor="'tc1'" options="statCtrl.device" connection="statCtrl.device.disconnected" style="min-width: 227px; max-width: 277px; height: 240px; margin: 5px; padding:0;text-align: center; "></libre>