setting fontSize in Themes not working any more.

[successanil]

setting fontSize in Themes not working any more .. I have tried setting fonts by giving exact sizes with units , but it seems, it has not effect .

body: {
"-webkit-user-select": "none",
"user-select": "none",
"color":"red",
"background-color": "tan",
'fontSize':'8px',
}

I am using demo example for epubjs-rn. Can anyone point me in right direction.

Thanks in advance.