body {
    font-family:
    "Microsoft YaHei",
    sans-serif;

    max-width:900px;
    margin:auto;
    padding:40px;

    line-height:1.8;
    color:#333;
}


header {

    text-align:center;
    padding:50px 0;

}


h1 {

    font-size:42px;

}


h2 {

    border-left:5px solid #2563eb;
    padding-left:15px;

}


section {

    margin-top:50px;

}


img {

    width:100%;
    margin:20px 0;

    border-radius:10px;

}


footer {

    margin-top:50px;
    color:#777;

}