html,body{
    width: 100%;
    height: 100%;
    background-color: black;
}
*{
    margin: 0;
    padding: 0;
}
.beianhao{
    height: 30px;
    bottom: 0;
    left: 0;
    font-size: 14px;
    width: 100%;
    line-height: 30px;
    text-align: center;
    position: absolute;
    z-index: 99;
    color: #828282;
    background-color: aliceblue;
}
.webImg{
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    margin: auto;
}
.logo{
    position: absolute;
    top: 10px;
    right: 10px;
    width: 7%;
    height: auto;
}