app/views/schools/live_data/_gauge.html.erb
<div class="row">
<div class="col-md-12 justify-content-center align-self-center">
<figure class="highcharts-figure">
<div class="live-data-chart" id="live-data-chart-<%= fuel_type.to_s %>" style="height: 400px;" data-title="Live energy data" data-refresh-interval='<%= cad.refresh_interval %>' data-timeout-interval='<%= timeout_interval %>' data-max-value='<%= cad.max_power %>' data-url='<%= school_cad_live_data_path(school, cad, format: :json) %>'></div>
</figure>
</div>
</div>