.denglu{
    font-family: Mircoresoft Yahei;
    text-align: center;
    background-color: rgb(208, 213, 217);
    width: 300px;
    height: 200px;
    border-style:ridge;
    border-radius: 20px;
    border: 11;
    margin: auto;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    
}