html {
  font-size: 13.33333vw;
  height: 100%;
}
body{
  background: url(../images/bg.png) no-repeat;
  background-size: 100% 100%;
  background-attachment: fixed;
}
.logo{
  margin: 20% auto 0;
  display: flex;
  justify-content: center;
}
.logo img{
  height: 2rem;
}
.title{
  margin: 0.6rem auto 0;
  color: #fff;
  font-size: 0.8rem;
  font-weight: bolder;
  text-align: center;
}
.txt{
  font-size: 0.3rem;
  color: #fff;
  width: 80%;
  margin: 0.6rem auto 0;
  padding: 0.3rem;
  background-color: rgb(202, 48, 48,0.8);
  border-radius: 0.2rem;
  line-height: 0.5rem;
}
.btn{
  margin: 0.6rem auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80%;
    background-color: #fff;
    height: 0.8rem;
    border-radius: 0.4rem;
    color: #c41111;
    font-size: 0.4rem;
    font-weight: bolder;
}
.btn a {text-decoration: none;
  color: #c41111;
}
.shdow{
  display: none;
}