.neibu{
    text-align: center;
    max-width: 800px;
    margin: auto;
    border: 5px solid greenyellow;
    border-radius: 10px;
    background-color: white;
}
.top1{
    color: goldenrod;
}
.botton{
    background-color: gold;
    color: #000;
    padding: 5px 7px;
    text-decoration: none;
    display: inline-block;
    border-radius: 5px;
    transition-duration: 0.4s;
}
.botton:hover{
    background-image: linear-gradient(to bottom right, gold,goldenrod);
    padding: 7px 9px;
    box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
}
.guanggao{
    max-width: 600px;
    margin: auto;
    border: #777 dashed 2px;
}
.link{
    color: goldenrod;
    text-decoration: none;
    display: inline-block;
    transition-duration: 0.4s;
}
.link:hover{
    color: coral;
}