body {
  background: black;
  overflow: hidden;
  margin: 0;
}

.grid-container {
  user-select: none;
  width: 100vw;
  height: 100vh;
  position: absolute;
  cursor: grab;
  cursor: -moz-grab;
  cursor: -webkit-grab;
}

.grid-container:active {
  cursor: grabbing;
  cursor: -moz-grabbing;
  cursor: -webkit-grabbing;
}

.card img {
  position: absolute;
  pointer-events: none;
  user-select: none;
  top: 0;
  left: 0;
}

.card {
  transition: opacity 0.5s;
  opacity: 1;
  overflow: hidden;
  position: absolute;
  width: 256px;
  height: 171px;
}

.card:hover {
  /*
  opacity: 0.5;
  */
}

.card.hidden {
  opacity: 0;
}