How to change the color of every hypertext link ?

Hi,

Thanks for the answer, where should I put the code ?

Here is the HTML code for the text editor, on the submit page

#html1 :

<!doctype html>
<html>
  <head>
    <meta charset="utf-8">   
    <script src="//cdn.ckeditor.com/4.6.2/basic/ckeditor.js"></script>  
    <script type="text/javascript">
     function init() {       
         window.onmessage = (event) => {  
         if (event.data == "save") {
            window.parent.postMessage(CKEDITOR.instances.CK1.getData(),"*"); 
         } else {
            CKEDITOR.instances.CK1.setData(event.data);
            window.parent.postMessage("set","*");
         }
       }
     }
     </script>
  </head>
  <body onload="init();">
    <textarea placeholder ="test" name="editor1" id="CK1"></textarea> 
    <script>
        CKEDITOR.replace("editor1"); 
        window.parent.postMessage("ready", "*");
    </script>
  </body>
</html>

I want the link to be recognizable on the “content” page (as I said, it works just like a forum, there is a page to post the message, then a page to see your post.)