How can I center a image in a HTML created by HtmlAgilityPack

I have a very simple HTML document created with the HtmlAgilityPack, with a embedded image; (base64 format)

Public Report As New HtmlDocument()

Dim html As String = "<!DOCTYPE html>
<html>
<body>
<img src=""data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAANUAAADICAIAAADwajORAAAAAXNSR0IArs4c6QAAAARn"" alt=""Red dot"" align=""middle""/>
</body>
</html> "

    Report.LoadHtml(html)
    WebBrowser1.DocumentText = Report.Text

The image displays on the left, I'd like to horizontally center it, how can this be done?

(The actual base64 image is shortened for obvious reasons)

Solution

The answer I was looking for was:

With the HtmlAgilityPack you can embed the CCS insite the HTLM like so:

       Dim html As String = "<!DOCTYPE html>
<html>
<body>
<head><style>html, body {
height: 100%;
margin:0;
padding:0;
}
.center {
display: block;
margin-left: auto;
margin-right: auto;

}
</style></head>
<div>
    <img src=""data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAANUAAADICAIAAADwajORA"" alt=""Red dot"" class=""center""/>
</div>
</body>
</html> "

Thanks to Mortb for pointing me in the right direction.