html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

#board {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  background-color: #222222;
}

.card {
  width: 320px;
  height: 320px;
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 1%;
  box-shadow: 0px 4px 4px 0px rgba(0, 0, 0, 0.1);
  background-color: white;
  transform: translateX(-50%) translateY(-50%) scale(0.95);
  background-size: cover;
  background-position: center;
}