Open every external link in a new window automatically (html, css)

I am searching for an option to open every external links from my website (wordpress-blog) to any other sites automatically in a new window. Is that with css or html possible without doing it 1000 times manually via hand as "target _blank"?

Thank you so much!

PS: sry for my bad english, I am no native speaker :(

Put this code in your theme functions.php file.

function cdx_handel_external_links() {
    ?>
<script type="text/javascript">
( function( $ ) {

    $("a[href^=http]").click(function(){
      if(this.href.indexOf(location.hostname) == -1) {
         $(this).attr({
            target: "_blank"
         });
      }
    })

   //Add Nofollow
   $("a").each(function(){
    if(this.href.indexOf('nytimes.com') >0 ){
        $(this).attr({
            rel: "nofollow"
         });
    }
   });

} )( jQuery );
</script>
   <?php
}
add_filter( 'wp_footer', 'cdx_handel_external_links', 999);