## Bug description

Sites built with Tailwind use a lot of classes like: `text-base leading-6 font-medium text-gray-500 hover:text-gray-900 focus:outline-none focus:text-gray-900 transition ease-in-out duration-150` 

The problem is with the ones that have a colon (`:`) inside them. Simmerjs crashes with the following:

```
Failed to execute 'querySelectorAll' on 'Document': 'A.text-base.leading-6.text-gray-400.hover:text-gray-500.hover:text-white' is not a valid selector
```

... bringing down the entire toolbar.

## Expected behavior

The toolbar shouldn't crash when your page contains a CSS class with a colon in it.

https://stackoverflow.com/questions/45110893/select-elements-by-attributes-with-colon

## How to reproduce

1. Make a page with a `<button />` that has a class `with:colon`.
2. Wait for a few events to be captured or click the button yourself
3. Open the toolbar, click "heatmap" and watch it burst up in flames (and then crash)

posthog/test/test_event_model.py
Person.objects.create(team=self.team, distinct_ids=["person1"], properties={"$browser": "Chrome"})
        Event.objects.create(event="$pageview", distinct_id="person1", team=self.team)
        action = Action.objects.create(name="pageview", team=self.team)
        ActionStep.objects.create(
            action=action, event="$pageview", properties=[{"key": "$browser", "value": "Chrome", "type": "person"}],
        )
        action.calculate_events()
        self.assertEqual(action.events.count(), 1)
    def test_empty(self):
        Person.objects.create(team=self.team, distinct_ids=["person1"], properties={"$browser": "Chrome"})
        action = Action.objects.create(name="pageview", team=self.team)
        ActionStep.objects.create(
            action=action, event="$pageview", properties=[{"key": "$browser", "value": "Chrome", "type": "person"}],
        )
        action.calculate_events()
        self.assertEqual(action.events.count(), 0)
class TestSendToSlack(BaseTest):