html, body {
  font-family: 'Helvetica Neue', Helvetica, STHeiTi, sans-serif;
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.mask {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 100;
  display: none;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,.7);
}

.mask {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate3d(-50%, -50%, 0);
          transform: translate3d(-50%, -50%, 0);
}

.share-text {
  color: #fff;
  margin: 5% 5% 0 5%;
  text-align: center;
  width: 90%;
}

.share-text+.share-text {
  color: #fff;
  margin-top: 2%;
  text-align: center;
  width: 90%;
}

.mask img {
  max-width: 280px;
  width: 30%;
  position: absolute;
  left: 50%;
  top: 50%;
  -webkit-transform: translate3d(-50%, -50% , 0);
  transform: translate3d(-50%, -50% , 0);
}