@media(min-width:768px){
    .daheiwanzi{
        height: 300px;
        display: block;
        flex: 1;
        border: #888888 solid 1px;}
        .daheiwanziimg{
            height: 300px;
        }
        .chouwai{
            flex: 1.5;
        }
        
    }

@media(max-width:768px){
    .daheiwanzi{
       height: 100px;
       
    }
    .daheiwanziimg{
        width: 100%;
    }
    .zi{
        margin: 0;
        padding: 0;
    }
    .chouwai{
        flex: 1.2;
    }
    
}

@media(max-width:650px){
    .chouwai{
        flex: 0.8;
    } }
@media(max-width:540px){
    .chouwai{
        flex: 0.4;
    } 
}
@media(max-width:420px){
    .chouwai{
        flex: 0.2;
    } 
}
@media(max-width:360px){
    .chouwai{
        flex: 0;
    } 
}
@media(min-width:1000px){
    .chouwai{
        flex: 0.75;
    }
}

    .board-index {
        background:linear-gradient(to right,rgba(0,0,0,.5),rgba(0,0,0,.5)),url(https://s2.loli.net/2022/12/30/ixocuBGHam36PgX.jpg);
        background-size: cover;
        background-position: center;
    }
    .an{
        background:transparent;	/*按钮背景透明*/
	border-width:0px;	/*边框透明*/
	outline:none;	/*点击后没边框*/
    margin-left: 45px;
    }
    .chou{
        width: 115px;
        margin-left: 13px;
    }