<link rel="stylesheet" href="shepherd-theme-arrows.css" />
<script src="tether.min.js"></script>
<script src="shepherd.min.js"></script>

const tour = new Shepherd.Tour({
  defaultStepOptions: {
    classes: 'shepherd-theme-arrows',
    scrollTo: true
  }
});

tour.addStep('example-step', {
  text: 'This step is attached to the bottom of the <code>. 
example-css-selector</code> element.',
  attachTo: { element: '.example-css-selector', on: 'bottom'},
  classes: 'example-step-extra-class',
  buttons: [
    {
      text: 'Next',
      action: tour.next
    }
  ]
});

tour.start();

const tour = new Shepherd.Tour({
  defaultStepOptions: {
    classes: 'shepherd-theme-arrows',
    scrollTo: true
  }
});

const steps = [];

steps.push({
  attachTo: {
    element: '.nav-tabs',
    on: 'top'
  },
  title: 'Welcome',
  text: `Allow me to show you how to plan a ${title}. <p>If you prefer, you can <a href="javascript::return false;" onclick="turnOffGuide();">turn off this guide</a>.<br /><br />`
});
steps.push({
  attachTo: {
    element: '#headingWho',
    on: 'top'
  },
  title: 'Who would you like to invite?',
  text: `You can add one person or a group of people to your ${title}. <p>Click the person button to add participants.</p>`
});
steps.push({
  attachTo: {
    element: '#invitation-url',
    on: 'bottom'
  },
  title: 'Inviting by email',
  text: 'Alternately, you can email the meeting link to your participant(s)'
});
steps.push({
  attachTo: {
    element: '#headingWhat',
    on: 'bottom'
  },
  title: 'What is your meeting about?',
  text: `You can customize the subject of your ${title}. We'll use it for the invitation and reminder emails.<p>Click the pencil button to edit the subject.</p>`
});
if ($('#headingActivity').length > 0) {
  steps.push({
    attachTo: {
      element: '#headingActivity',
      on: 'top'
    },
    title: 'What do you want to do?',
    text: 'You can suggest one or more activity ideas. With multiple ideas, your participants can help you select their favorite. <p>Click the plus button to suggest activities.</p>'
  });
}
steps.push({
  attachTo: {
    element: '#headingWhen',
    on: 'top'
  },
  title: 'When do you want to meet?',
  text: `Suggest one or more dates and times for your ${title}. With more than one, your participants can help you choose. <p>Click the + button to add them.</p>`
});
steps.push({
  attachTo: {
    element: '#headingWhere',
    on: 'top'
  },
  title: 'Where do you want to meet?',
  text: `Suggest one or more places for your ${title}. With multiple places, your participants can help you choose. <p>We use Google Places to simplify adding them. Click the + button to begin.</p>`
});
steps.push({
  attachTo: {
    element: '.virtualThing',
    on: 'top'
  },
  title: 'Is this a virtual meeting?',
  text: `Switch between <em>in person</em> and <em>virtual</em> ${title}s such as phone calls or online conferences.`
});
steps.push({
  attachTo: {
    element: '#actionSend',
    on: 'top'
  },
  title: 'Sending invitations',
  text: `Scheduling is collaborative. After you add times and places, you can <strong>Invite</strong> participants to select their favorites. <em>A place isn't necessary for virtual ${title}s.</em>`
});
steps.push({
  attachTo: {
    element: '#actionFinalize',
    on: 'right'
  },
  title: 'Finalizing the plan',
  text: `Once you choose a time and place, you can <strong>Complete</strong> the plan. We'll email the invitations and setup reminders.`


});
steps.push({
  attachTo: {
    element: '#tourDiscussion',
    on: 'left'
  },
  title: 'Share messages with participants',
  text: 'You can write back and forth with participants on the <strong>Messages</strong> tab. <p>Messages are delivered via email.</p>'
});
steps.push({
  attachTo: {
    element: '.container',
    on: 'top'
  },
  title: 'Ask a question',
  text: `Need help? <a href="${$('#url_prefix').val()}/ticket/create">Ask a question</a> and we'll respond as quickly as we can. <p>If you prefer, you can <a href="${$('#url_prefix').val()}/user-setting?tab=guide">turn off the guide</a> in settings.</p>`
});

for (let i = 0; i < steps.length; i++) {
    
    let buttons=[];
    
    // no back button at the start 
    if (i>0) {
        buttons.push({
          text: 'Back',
          classes: 'shepherd-button-secondary',
          action: function() {
            return tour.back();
          }
        });
    }
    
    // no next button on last step 
    if (i!=(steps.length-1)) {
        buttons.push({
          text: 'Next',
          classes: 'shepherd-button-primary',
          action: function() {
            return tour.next();
          }
        });
    } else {
        buttons.push({
          text: 'Close',
          classes: 'shepherd-button-primary',
          action: function() {
            return tour.hide();
          }
        });
    }

    tour.addStep(`step_${i}`, {
        text: steps[i].text,
        title: steps[i].title,
        attachTo: steps[i].attachTo,
        classes: 'shepherd shepherd-open shepherd-theme-arrows shepherd-transparent-text',
        buttons: buttons,
    });
}

<?php
namespace frontend/assets;
use yii/web/AssetBundle;
class MeetingAsset extends AssetBundle
{
    public $basePath = '@webroot';
    public $baseUrl = '@web';
    public $css = [
      ...
      'css/shepherd-theme-arrows.css',      
    ];
    public $js = [
      'js/meeting.js',
      ...
      'js/tether.min.js',
      'js/shepherd.min.js',
      'js/meeting_tour.js',
    ];
    ...

.shepherd-element.shepherd-theme-arrows {
  max-width: 40%;
}