How to separate pages in IN_LINE mode

I use adobe pdf embed api viewer in IN_LINE mode and cannot separate pages with css. For some reason the selectors I use do not update the document. But when I use the same css selectors in the browser's inspector the pages are separated. I also have to mention that the document is generated with the below js script

function displayDocument(fileName, clientId, arrayBuffer, embedMode) {
	var adobeDCView = new AdobeDC.View({clientId: clientId, divId: "adobe-dc-view-id"});
	adobeDCView.previewFile({
		content:{promise: Promise.resolve(arrayBuffer)},
		metaData:{fileName: fileName}
	}, {embedMode: embedMode});
}

 
where the content is an arrayBuffer 

Can you suggest a way to separate pages with IN_LINE mode?