.article_info{
    width: 100%;
    height: auto;
    background: #f9f9f9;
}
.article_div{
    letter-spacing:0.1em;
    width: 1200px;
    margin: 0 auto;
    font-size: 14px;
    font-weight: bold;
    line-height: 40px;
}
section{
    width: 1200px;
    margin: 50px auto 80px ;
    display: flex;
    justify-content: start;
}
.article-nav>a{
    font-size: 16px;
    display: block;
    border: #eee 1px solid;
    width: 200px;
    line-height: 35px;
    text-align: center;
    font-weight: 550;
    margin-right: 40px;
}
.article-nav>a.on{
background: #f9f9f9;
color: #0da574;
border-left:#0da574 2px solid;
width: 199px;
}
.article-content>p{
    margin-bottom: 30px;
}
.article-content{
    font-size: 16px;
    line-height: 25px;
    letter-spacing: 0.1em;
}

/*手机端*/

@media screen and (max-width: 640px)  {
    
        .article_div{
            width: 98%;
            font-size: 0.1rem;
            line-height: 0.4rem;
        }
        section{
            width: 95%;
            display: block;
            margin: 0 auto 1rem;
        }
        
        .article-nav>a{
            display: inline-block;
            width: auto;
            border: none;
        line-height: 0.7rem;
        text-align: center;
        font-weight:normal;
        margin-right : 0.2rem;
        font-size: 15px;
        }
        .header-nav{
            display: none !important;
        }
        .article-nav{
            border-bottom: 1px solid #eee;
        }
        .article-nav>a.on {
            background: #fff;
            color: #0da574;
            border-bottom: #0da574 2px solid;
            width: auto;
            font-weight: 550;
            border-left: none;
            font-size: 16px;
        }
        .article-content{
            font-size: 14px;
            margin-top:  0.1rem;
        }
    .article-content img{
        max-width: 100%;
    }
        .article-content>p{
            margin-bottom: 0.3rem;
        }
}