HTML: Full Screen any image

<?php
//path to directory to scan. i have included a wildcard for a subdirectory
$directory = "./";

//get all image files with a .jpg extension.
$images = glob("" . $directory . "*.{jpg,png}", GLOB_BRACE);

$imgs = '';
// create array
foreach($images as $image){ $imgs[] = "$image"; }

//shuffle array
shuffle($imgs);

//select first 20 images in randomized array
$imgs = array_slice($imgs, 0, 1);

echo "
<html>
<head>
<style>
img {
  position: fixed;
  top: 0;
  left: 0;

  /* Preserve aspet ratio */
  min-width: 100%;
  min-height: 100%;
}
</style>
</head>
<body>
";
//display images
foreach ($imgs as $img) {
    echo "<img src='$img'> ";
echo "
</body>
</html>
";

}
?>