You can define your own template for the message box instead of using the default template.
var mytutorial = new Tutorial({ steps: [ { highlight: '.first-step', text: 'the first step', action: { template: '#custom-template' } } ] });
<p class="first-step"> This is the first step in our Tutorial! </p> <script type="text/template" id="custom-template"> This is custom content inside the message box <span t-close>Custom close button></span> </script>