Blurry screenshots

[crawlcars]

If I try to take a screenshot of the following url, it comes out "blurry".

https://twitter.com/KeanuReevesoff1/status/1047128450547556353

Below is the code that I've written.

function takeScreenshotOfUrl(string $url, int $width = 400, int $height = 500): ?string {
$saveLocation = $SERVER['DOCUMENT_ROOT'] . '/screenshots/';
$fileName = date("y_m_d__G_i_s");
$counter = 0;
do {
$tempFileName = $fileName . ($counter > 0 ? "" . $counter : "") . ".png";
++$counter;
} while (file_exists($tempFileName));
$fileName = $tempFileName;
unset($counter, $tempFileName);

  if ($height > 500)
        $height = 500;

  $screenCapture = new Capture($url);
  $screenCapture->setWidth($width);
  $screenCapture->setHeight($height);
  $screenCapture->setImageType('png');
  $screenCapture->setDelay(5000);
  $screenCapture->save($saveLocation . fileName);
  	
  if (file_exists($saveLocation . $fileName)) 
        return $fileName;
  return null;

}