*{
  margin: 0; padding: 0;
}
html{
  font-size: calc(100vw/7.5)
}
html, body{
  width: 100%;
  height: 100%;
  overflow: hidden;

}

.mark{
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  border-radius: 5px;
  background: rgba(0,0,0,0.4);
  font-size: 16px;
  position: fixed;
  text-align: center;
  line-height: 50px;
  color: #fff;
  z-index: 10;
}

.mark_title{
  width: 92%;
  height: 50px;
  top: 10px;
  left: 4%;
  border-radius: 5px;
  background: rgba(0,0,0,0.6);
  font-size: 16px;
  position: fixed;
  text-align: center;
  line-height: 50px;
  color: #fff;
  z-index: 100;
}

.main{
  width: 100%;
  height: 100%;
  font-size: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: url('../img/bg.png') no-repeat;
  background-size: 100% 100%;
}
@media screen and (min-width: 500px){
  .main{
    width: 375px;
    height: 741px;
    margin: 20px auto;
  }
}

.main .btn{
  position: fixed;
  bottom: 50px;
  display: flex;
}

.main .btn .ios, .android{
  display: flex;
  justify-content: center;
  align-items: center;
  width: 160px;
  height: 44px;
  border-radius: 8px;
  border: 1px solid #FFE7C8;
  font-size: 16px;
  color: #FFE7C8;
}

.main .btn .ios{
  margin-right: 13px;
}