## 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
ActionStep.objects.create(event="$autocapture", action=action1, selector="div > div > a")
        ActionStep.objects.create(
            event="$autocapture", action=action1, selector="div > a.somethingthatdoesntexist",
        )
        action1.calculate_events()
        events = Event.objects.filter_by_action(action1)
        self.assertEqual(len(events), 1)
        self.assertEqual(events[0], event2)
        
        action2 = Action.objects.create(team=self.team)
        ActionStep.objects.create(action=action2, selector="div > a:nth-child(2)")
        action2.calculate_events()
        events = Event.objects.filter_by_action(action2)
        self.assertEqual(len(events), 1)
        self.assertEqual(events[0], event2)
        
        action3 = Action.objects.create(team=self.team)
        ActionStep.objects.create(action=action3, selector="[id='someId']")
        action3.calculate_events()
        events = Event.objects.filter_by_action(action3)
        self.assertEqual(len(events), 1)
        self.assertEqual(events[0], event2)
        
        action4 = Action.objects.create(team=self.team, name="action1")
        ActionStep.objects.create(event="$autocapture", action=action4, selector="[id='nested'] a")
        action4.calculate_events()
        events = Event.objects.filter_by_action(action4)
        self.assertEqual(len(events), 1)
        self.assertEqual(events[0], event1)
    def test_with_normal_filters(self):