Hi, great lib! It is helping me very much.

I notice that, when the <DatePicker /> or <DateRangePicker /> is placed inside a collapsible element which in the first render has a display: none;, it doesn't render correctly.

Here is the reproduced example in codesandbox

Going further, comparing with the rendered element in the docs, I see that the wide class is not applied to .nice-dates-day and .nice-dates-grid is rendered with height: 6px.

Perhaps this happens because the initial width of the ref element is 0 and by that it can't render correctly?

I can open a PR setting a mininum height for .nice-dates-day and .nice-dates-grid but I'd like to discuss it here before to check if this is the best option available.