html, body, p,span, div, a, ul,ol,li, h1, h2, h3, h4 {
    margin: 0;
    padding: 0;
}
*{
    box-sizing: border-box;
}
html, body {
    width: 100%;
    height: 100%;
}
body{
    font-family: PingFangSC-Regular,arial,微软雅黑,sans-serif;
}
a{
    text-decoration: none;
}
li{
    list-style: none;
}
img{
    width: 100%;
    display: block;
    height: 100%;
}
a:link{
    color: #000;
}
a:visited{
    color: #000;
}
.clear:after {
    display: block;
    clear: both;
    content: "";
    visibility: hidden;
    height: 0;
}
@media only screen and (min-width: 320px)  and (max-width: 359px) {

    html {
        font-size: 17.1px;
    }
}

@media only screen and (max-width: 374px) and (min-width:360px) {
    html {
        font-size: 19.2px;
    }
}

@media only screen and (min-width: 375px) and (max-width:399px) {
    html {
        font-size: 20px;
    }
}

@media only screen and (min-width: 414px) and (max-width:639px) {
    html {
        font-size: 22.08px;
    }
}