HTML 5 how to adjust the position of the scanning window, please-CodePudding

I call webcam so

 function getScanObj () {
If (scanObj & amp; & ScanObj. IsClose) {
ScanObj=null; 
} 
if(! ScanObj) {
ScanObj=new plus. The barcode. The barcode (" scanContainer ", [plus. Barcode. QR, plus the barcode. The EAN13, plus the barcode. EAN8] and {
Background: # 0000 ff, 
FrameColor: '# 6495 Ed, 
Position: 'static', 
Top: '15%', 
Left: 'auto' 
}); 
} 
ScanObj. Onmarked=function (type, code, file) {
Plus. NativeUI. Toast (code); 
ScanObj. Close (); 
}; 

The console. The log (JSON. Stringify (scanObj)); 
Return scanObj; 
}

The results are as follows:

How to adjust can scan window within scanContainer, top: '15%' this attribute has no effect, how do you I want to set?