body{background: url(/public/images/bg.jpg) fixed center center; width: 100%; background-size: cover; }
.login-box{
  position: absolute;
  left: 50%;
  top: 50%;
  margin-top: -225px;
  margin-left: -200px;
  z-index: 15;
}
.login {
  width: 400px;
  z-index: 2;
  padding: 40px 0 40px;
  background-color: #fff;
}
.img-box { position: relative; width: 208px; margin: 10px auto; }
.login h3 { font-size: 20px; text-align: center; margin-bottom: 15px;}
.login .error { text-align: center; color: red; }
.login .layui-form-item { width: 300px; margin: 20px auto; }
.login .layui-input-block { margin-left: 0; }
.login button { width: 100%; font-size: 16px; }