.clearfix::before,
.clearfix::after{
    content: '';
    display: table;
    clear: both;
}
a{
    text-decoration: none;
}
body{
    font: 14px "PingFang SC", "Lantinghei SC", "Microsoft YaHei", "HanHei SC", "Helvetica Neue", "Open Sans", Arial, "Hiragino Sans GB", 微软雅黑, STHeiti, "WenQuanYi Micro Hei", SimSun, sans-serif;
    min-width: 1280px;
}

.w{
    width: 1280px;
    margin: 0 auto;
}