Set max-width and max-height of pop-ups in Express Map

dshakya

It would be good to be able to set the height and width of the pop-ups in Express maps as the current width seems a bit narrow for a paragraph of text. This could be based on the height and width of the map itself or the viewport. 

Even if the current max-width calculation of 20rem changed to 30rem provides a decent width of the pop-up.

.popup-summary{
max-width: calc(20rem * var(--storymaps-spacing-scale, 1) * var(--aspect-ratio-canvas-font-scale, 1))
}