WP shortcode with ATTS

function random_picture($atts) {
   extract(shortcode_atts(array(
      'width' => 400,
      'height' => 200,
      'class'  => 'class_here'
   ), $atts));
//return '<img src="https://lorempixel.com/'. $width . '/'. $height . '" />';
return '<span class="' . esc_attr($class) . '">' . $content . '</span>'
}

add_shortcode('picture', 'random_picture');