html,
body {
  height: 100%;
}
a {
  color: black;
  text-decoration: none;
}
body {
  background: url("../img/page2背景.jpg");
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center;
  background-size: cover;
}
.plateImg {
  width: 320px;
  height: 120px;
}
.signoutImg {
  width: 100px;
}
.moduleImg {
  width: 300px;
  height: 100px;
}

.chpwdtext:hover{
  color:black;
}