body,html {
  padding: 0;
  margin: 0;
  background-color: #fff;
  font-size: 16px;
}

#app {
  max-width: 750px;
  margin: 0 auto;
}
#app * {
  box-sizing: border-box;
}

.img-wrapper {
  position: relative;
  font-size: 0;
}
.img-wrapper>img{
  width: 100%;
}
.app-divider {
  width: 100%;
  height: .3rem;
}
.app-data {
  position: absolute;
  font-size: .68rem;
  width: 100%;
  text-align: center;
  color: #e44646;
}
.app-btn {
  position: absolute;
  left: 0;
  width: 100%;
}
.video-wrapper {
  padding: 4%;
  font-size: 0;
}
.video-border {
  border-radius: .26rem;
  overflow: hidden;
  box-shadow: 0 5px 10px rgba(0,0,0,.3);
  background-color: #fd913f;
  padding: .14rem;
  position: relative;
}
.video-border>video {
  border-radius: .26rem;
}
.video-shadow {
  position: absolute;
  top: .14rem;
  left: .14rem;
  width: calc(100% - .28rem);
  height: calc(100% - .28rem);
  background-color: rgba(0, 0, 0, .2);
  border-radius: .26rem;
}

.bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url(../img/block-1.jpg);
  background-size: contain;
  background-position: bottom;
  filter: blur(10px);
}

#hand {
  animation: zoom 1s infinite;
}

#slide-btn {
  position: fixed;
  width: 100%;
  bottom: 0;
  left: 0;
  transition: transform .25s;
}
#slide-btn.hide {
  transform: translateY(100%);
}

@keyframes zoom {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.15);
  }
  100% {
    transform: scale(1);
  }
}