*{
    margin: 0;
    padding: 0;
}
html,body{
    width: 100%;
    min-width: 1200px;
    max-width: 1920px;
    margin: 0 auto;
}
.top{
    width: 100%;
    background-color: #00000030;
    position: fixed;
    top: 0;
    z-index: 999;
}
.top_s{
    width: 1200px;
    margin: auto;
    line-height: 60px;
}
.logo img{
    float: left;
    margin-top: 10px;
}
.logo p{
    float: left;
    font-size: 24px;
    margin-left: 10px;
    color: #ffffff;
}
.tab{
    float: right;
}
.tab a{
    font-size: 18px;
    margin-left: 80px;
    color: #ffffff;
    text-decoration: none;
}
.banner{
    /* width: 100%; */
    max-width: 1920px;
    min-width: 960px;
    height: 700px;
    background-image: url(img/banner.png);
    background-size:1920px 700px;
    background-repeat: no-repeat;
    background-position: top;
    background-attachment: fixed;
}
.banner_s{
    max-width: 1200px;
    min-width: 960px;
    margin: 0 auto;
}
.banner_s h1{
    padding-top: 220px;
    color: #ffffff;
    font-size: 60px;
    transition: all 0.5s cubic-bezier(0.075, 0.82, 0.165, 1);
}
.banner_s p{
    margin-top: 10px;
    color: #ffffff;
    font-size: 24px;
    transition: all 0.5s cubic-bezier(0.075, 0.82, 0.165, 1);
}
.banner_s a{
    display: block;
    width: 200px;
    height: 54px;
    margin-top: 140px;
    border:1px solid #ffffff;
    border-radius: 27px;
    color: #ffffff;
    font-size: 18px;
    line-height: 54px;
    text-align: center;
    text-decoration: none;
    transition: all 0.5s cubic-bezier(0.075, 0.82, 0.165, 1);
}
.banner_s a:hover{
    background-color: #ffffff;
    border:1px solid #ffffff;
    color: #0f63e0;
}
h2{
    line-height: 160px;
    font-size: 30px;
    text-align: center;
    font-weight: normal;
}
.ad_s{
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
}
.ad_s li{
    width: 200px;
    list-style: none;
}
.ad_s li p{
    margin: 30px 0;
    font-size: 18px;
    text-align: center;
}
.api_s{
    width: 1200px;
    margin: 0 auto;
}
.about{
    width: 100%;
    margin-top: 60px;
    background-image: url(img/about.png);
    background-size:1920px 700px;
    background-repeat: no-repeat;
    background-position: bottom;
    background-attachment: fixed;
}
.about_w{
    width: 100%;
    padding-bottom: 60px;
    background-color: #ffffffcc;
}
.about_s{
    max-width: 1200px;
    margin: 0 auto;
}
.about_s h3{
    margin-bottom: 20px;
    font-size: 24px;
    line-height: 25px;
    font-weight: normal;
}
.about_s h3 i{
    display: block;
    float: left;
    width: 6px;
    height: 24px;
    margin-right: 8px;
    background-color: #0f63e0;
}
.about_s p{
    font-size: 18px;
    line-height: 2em;
}
.about_s p span{
    color: #0f63e0;
}
.footer{
    width: 100%;
    height: 60px;
    background-color: #000000cc;
    color: #ffffff;
    font-size: 16px;
    line-height: 60px;
    text-align: center;
}
.footer span, .footer a{
    color: #ffffff;
}