*{margin:0;padding:0;}
body{font-size:12px; font-family: "微软雅黑"}
ul,li{ list-style: none; }
a{ text-decoration: none; color: #333333;}
header{ position: fixed;top:0;left:0; height: 100px; line-height: 100px; background: #ffffff;width:100%; text-align: center}
header ul{display:flex;justify-content:center; margin-top:10px;}
header ul li{ line-height: 80px; padding-right: 50px;font-size:24px;}
img{display:block;}
.section-box{margin-top:100px;}
footer{ text-align: center; height: 50px; background: #333333;line-height:50px;color:#ffffff;font-size:18px;}
footer a{color:#ffffff}

@media screen and (max-width: 750px) {
    header{height:auto; line-height: normal}
    header ul{margin-top:20px; overflow: scroll;justify-content:left;}
    header ul li{line-height: normal; padding-left: 10px; padding-right: 0px;}
}