html, body, div, img {
  display: block;
  width: 100%;
  padding: 0;
  margin: 0;
}

@media screen and (min-width: 412px) {
  body {
    max-width: 412px;
    margin: auto;
  }
}

.wrapper {
  position: relative;
  .container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 80%;
    margin: auto;
    perspective: 1000;
  }
  .lottery-wrap {
    position: absolute;
    top: 14%;
    left: 14%;
    right: 12%;
    bottom: 14%;
    width: auto;

    .lottery-unit {
      float: left;
      position: relative;
      width: 33%;
      height: 31.3%;
      margin: 1.6% 0 0 0;
      transform: rotateY(0deg);
      transform-style: preserve-3d;
      transition: transform 0.8s ease-out;

      .unit-front,
      .unit-back {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: transparent center no-repeat;
        background-size: contain;
        backface-visibility: hidden;
      }
      .unit-front{
        background-image: url(./front.png);
      }
      .unit-back {
        border-radius: 3px;
        border: 2px solid #9d4cfe;
        background-color: #b879ff;
        text-align: center;
        transform: rotateY(180deg);
        box-sizing: border-box;
        width: 94%;
        color: #fff;
      }
    }
    .lottery-active {
      transform: rotateY(180deg);
    }
  }
}