*{
    font-size: 0;
}

<br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function file_get_content() in /Users/maksym/htdocs/my-wp-website/wp-content/themes/mytheme/index.php:35
Stack trace:
#0 /Users/maksym/htdocs/my-wp-website/wp-includes/template-loader.php(77): include()
#1 /Users/maksym/htdocs/my-wp-website/wp-blog-header.php(19): require_once('/Users/maksym/h...')
#2 /Users/maksym/htdocs/my-wp-website/index.php(17): require('/Users/maksym/h...')
#3 {main}
  thrown in <b>/Users/maksym/htdocs/my-wp-website/wp-content/themes/mytheme/index.php</b> on line <b>35</b><br />