body{
   margin: 0;
   border:0;
   padding: 0;
}
.bg{
   height: 100vh;
   width: 100vw;
   background-image: url(loginBg.jpg);
   display: flex;
   align-items: center; /* 垂直居中 */
   justify-content: center; /* 水平居中 */
}
.text{
   text-align: center;
   width: 50%;
   /* height: 50%; */
   position:absolute;
   color: #313131;
   font-size: 20px;
   background-color: rgba(255,255,255,0.85);
   border-radius: 7px;
   padding: 30px;
}
.webAddress{
   font-weight: bold;
   color: red;
}