Resizing the cards

The card SVG images maintain the aspect ratio of an image. All you need to do is to set the width of the card. For example in JQuery

$("card").width("100px")

Here's a function that will increment the size of the cards.

function incrementCard(cards, v) {
  if (cards.length == 0) return;
  var width = cards[0].clientWidth + v;
  if (width > 0)
      cards.width(width + "px");
}