Board Thread:Support Requests - Getting Technical/@comment-27007907-20151205205453/@comment-1757994-20151205213622

FWIW, what I do with portable infoboxes is

 /* fix portable infobox data */ .pi-data { display: block; width: 250px; /* .portable-infobox{width} - .pi-item-spacing{padding} */ width: -moz-available; }

That will probably do what you want.