Sense Mashups-where are the properties of the placeholder class for div elements defined?

[#1]

Hi there,

I am creating Qlik Sense mashups. I tend to design my own template to use as a base for the mashup. Now, I have problem overriding properties for the div elements predefined in mashup templates in the Dev Hub,ie I want to be able to write my own div elements that can hold Qlik Sense objects for me. How can I do that?

Thanks,