function getWebviewContent(uri) {
return `<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel='stylesheet' href='`+ uri + `' /> //This is the addition
    <title>Example Webview</title>
 <h1>This works!</h1>
 //Add some custom HTML here
downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter