## 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
def test_create_elements(self):
        elements = [
            Element(tag_name="button", text="Sign up!"),
            Element(tag_name="div"),
        ]
        group1 = ElementGroup.objects.create(team=self.team, elements=elements)
        elements = list(Element.objects.all())
        self.assertEqual(elements[0].tag_name, "button")
        self.assertEqual(elements[1].tag_name, "div")
        elements = [
            Element(tag_name="button", text="Sign up!"),
            
            Element(tag_name="div", event=Event.objects.create(team=self.team)),
        ]
        group2 = ElementGroup.objects.create(team=self.team, elements=elements)
        self.assertEqual(Element.objects.count(), 2)
        self.assertEqual(group1.hash, group2.hash)
        
        team2 = Team.objects.create()
        group3 = ElementGroup.objects.create(team=team2, elements=elements)
        group3_duplicate = ElementGroup.objects.create(team_id=team2.pk, elements=elements)
        self.assertNotEqual(group2, group3)
        self.assertEqual(ElementGroup.objects.count(), 2)
class TestActions(BaseTest):