<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> Being able to show charts and documents in plain text is a great way to keep track of your material and make it easy for others to understand what you're talking about. <a href="https://recorderchartsandpens.com/pens/">Chart recorder pens</a> are a good choice because they allow you to mark up any paper using only vertical lines and circles. Chart recorder pens are a must-have when you need to chart your moods, work out your goals and make plans for the future.