.btn {
  display: inline-block;
  position: relative;
  z-index: 1;
  min-width: 200px;
  background: #FFFFFF;
  border: 2px solid goldenrod;
  border-radius: 4px;
  color: goldenrod;
  font-size: 1rem;
  text-transform: uppercase;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  overflow: hidden;
  transition: 0.5s;
  padding: 10px 20px;
  box-shadow: 10px 10px 5px #888888;
}
.btn span {
  position: absolute;
  width: 25%;
  height: 100%;
  background-color: goldenrod;
  transform: translateY(150%);
  border-radius: 50%;
  left: calc((var(--n) - 1) * 25%);
  transition: 0.5s;
  transition-delay: calc((var(--n) - 1) * 0.1s);
  z-index: -1;
}
.btn:hover,
.btn:focus {
  color: black;
}
.btn:hover span {
  transform: translateY(0) scale(2);
}
.btn span:nth-child(1) {
  --n: 1;
}
.btn span:nth-child(2) {
  --n: 2;
}
.btn span:nth-child(3) {
  --n: 3;
}
.btn span:nth-child(4) {
  --n: 4;
}


.bg{
  background-image: url('./bgp.jpg');
  background-size: 108%;
  background-repeat: no-repeat;
}
.h1{
  font-size: 80px;
  color: azure;
  display: inline-block;
  font-family: '微软雅黑';
  position: relative; 

}
  
.h1[data-text]::after {  
    content: attr(data-text);  
    color: rgb(157, 255, 0);  
    position: absolute;  
    left: 0;  
    z-index: 2;
    -webkit-mask-image: -webkit-gradient(linear, 0 0, 0 bottom, from(#ff0000), to(rgba(0, 0, 255, 0)));
}


.img{
  width:80px ;
  height:80px;
}
.title{
  display: flex;
  justify-content: center;
  align-items: center;

  background-image: linear-gradient(to right, orange, purple);
  -webkit-background-clip: text;
  color: transparent;


}
.login_msg {
  float: left;
  position: absolute;
  top: 3%;
  left: 82%;
}


.login_msg .login_msg_code {
  display: none;
  min-width: 200px;
  border-radius: 5px;
}

.login_msg:hover .login_msg_code {
  display: block;
}