.my-flip {
  display: inline-block;
  position: relative;
  border-radius: 10px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, .8);
  // border: 1px solid #111;
  color: #fff;
  font-family: helvetica neue, Helvetica, sans-serif;
  font-weight: 700;

  &__mini {
    font-size: 40px;
    width: 40px;
    height: 60px;
    line-height: 60px;
  }
  &__small {
    font-size: 70px;
    width: 56px;
    height: 80px;
    line-height: 80px;
  }
  &__medium {
    font-size: 90px;
    width: 70px;
    height: 100px;
    line-height: 100px;
  }

  &__top, &__shadow-top, &__bottom, &__shadow-bottom {
    position: absolute;
    left: 0;
    right: 0;
    overflow: hidden;
    height: 50%;
    padding: 0 10px;
    text-align: center;
  }

  &__top, &__shadow-top {
    border-bottom: 1px solid #333;
    box-sizing: border-box;
    top: 0;
    z-index: 0;
    border-radius: 10px 10px 0 0;
    &::before {
      content: "";
      height: 100%;
      width: 100%;
      position: absolute;
      left: 0;
      top: 0
    }

    .my-flip-previous & {
      opacity: 1;
      z-index: 2;
      -webkit-transform-origin: 50% 100%;
      -webkit-animation: flipTop .3s ease-in both;
      transform-origin: 50% 100%;
      animation: flipTop .3s ease-in both;
    }
  }

  &__shadow-top {
    background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(rgba(0, 0, 0, 0)), to(black));
    width: 100%;
    opacity: 0;
    -webkit-transition: opacity .3s ease-in
  }

  &__bottom, &__shadow-bottom { 
    bottom: 0;
    z-index: 0;
    border-radius: 0 0 10px 10px;
    box-sizing: border-box;
    &:before {
      content: ""; 
      border-radius: 0 0 10px 10px;
      height: 100%;
      width: 100%;
      position: absolute;
      left: 0;
      top: 0
    }

    .my-flip-previous & {
      z-index: 1;
      opacity: 1
    }
  }

  &__bottom {
    .my-flip__wrap {
      display: block;
      //margin-top: -100%
    }
  }

  &__shadow-bottom {
    background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(black), to(rgba(0, 0, 0, 0)));
    opacity: 0;
    -webkit-transition: opacity .3s ease-in;
    //width: 50px;
    width: 100%;
  }

  // 翻页效果
  &__top {
    .my-flip-active & {
      z-index: 1
    }
  }
  &__bottom {
    .my-flip-active & {
      z-index: 2;
      -webkit-transform-origin: 50% 0%;
      -webkit-animation: flipBottom .3s .3s ease-out both;
      transform-origin: 50% 0%;
      animation: flipBottom .3s .3s ease-out both;
    }
  }
}

@-webkit-keyframes flipTop {
  0% {
    -webkit-transform: perspective(400px) rotateX(0deg)
  }
  100% {
    -webkit-transform: perspective(400px) rotateX(-90deg)
  }
}

@-webkit-keyframes flipBottom {
  0% {
    -webkit-transform: perspective(400px) rotateX(90deg)
  }
  100% {
    -webkit-transform: perspective(400px) rotateX(0deg)
  }
}