how to handle custom css property fro widget in Devhub Qliksense ?

[satyaban]

Dear Team,

I am trying to create simple KPI widget using html and css and it is working fine.
But I want to change some chart property like height of that KPI once added .
If I am inspecting same KPI chart in qlik dashboard and doing changes css code then it is working fine but If I am adding it in CSS code of that widget in widget editor and integrating it with dashboard it is not working .

Kindly suggest how to add same qlik css code sothat KPI will change accordingly in dashboard . 

CSS Code :

.touch-off .qv-client.qv-card #qv-stage-container #grid .qv-object .qv-object-header.thin {
    height: 0px;
}

same code only work when inspecting in browser but I need to either integrate it with widget editor code or as property for that widget and allow user to insert same CSS code .