@font-face{
    font-family:'siyuan'; 
    src:url('SourceHanSansCN-Regular.otf');
}
* {
  margin: 0;
  padding: 0; 
  font-family:'siyuan';
}
.header {
    width: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    height: 70px;
    box-shadow: 3px 0px 10px 0px rgb(0 0 0 / 10%);
    display: flex;
    justify-content: center;
    align-items: center;
    background: #fff;
}
.header-nav > ul{
    display: flex;
    flex-direction: row;
    list-style: none;
}
.header-nav > ul li {
    margin: 0 20px;
}
.header-nav > ul li:hover>a {
    color: #0091FF;
}
.header-nav > ul li:hover > ul {
    display: block;
    position: absolute;
    top: 70px;
    list-style: none;
    width: 160px;
    text-align: center;
    box-shadow: 3px 0px 10px 0px rgb(0 0 0 / 10%);
}
.header-nav > ul li a {
    text-decoration: none;
}

.nav-sub {
    display: none;
}
.nav-sub>li{
    height: 50px;
    line-height: 50px;
    text-align: center;
    color: #333;

}
.header-right {
    margin-left: 40px;
    display: flex;
    flex-direction: row;
}
.header-right div {
    margin: 0 16px;
    height: 36px;
    width: 180px;
}
.header-right div:nth-child(1) {
    line-height: 36px;
    text-align: center;
    border: 1px solid #0091FF;
    font-size: 14px;
    color: #0091FF;
}
.header-right div:nth-child(2) {
    line-height: 36px;
    text-align: center;
    border: 1px solid #0091FF;
    background: #0091FF;
    font-size: 14px;
    color: #fff;
}
.content {
    margin-top: 70px;
}
.footer{
    padding: 50px 0;
    background: rgba(47,54,61,1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-size: 14px;
}
.footer a {
    color: #666;
    font-size: 14px;
    text-decoration: none;
}
.content{
    width: 100%;
}
.content img{
    width: 100%;
    height: auto;
}