Resize doesn't work with `horizontal: true`

[lunule]

I'm not sure if this is intentional - maybe it's just that I don't fully grasp what this setting means, but I can't imagine a scenario where the container width shouldn't accommodate upon resize; and that's what I see when I set horizontal to true.

I checked the official CodePen horizontal example, and I see the same result, it's not resizable. The grid gets a width value on page load, and this value doesn't get updated when the viewport is resized.

Test case: https://codepen.io/desandro/pen/naPxde

Thanks for taking a look into this.