fix chrome flexbox layouts in chrome 72, 73+

Chrome 72 introduced a change in how flexbox elements with height: 100% renders, that caused some strange product breakage from one day to another without any code change.

The fix was simple but hard to find. flexbox elements with height: 100% now need to have min-height set, even 0 value is ok.

.list {
  display: flex;
}

.item {
  height: 100%;
  min-height: 0; /* add this */
}

more info: https://developers.google.com/web/updates/2019/01/devtools