.header{
    width: 100%;
}
.header .header-nav {
    width: 100%;
    height: 70px;
    position: fixed;
    top: 0;
    background-color: #fff;
    z-index: 100;
}
.header .header-nav .header-nav-box{
    width: 1200px;
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items:Center;
}
.header .header-nav img{
    width: 165px;
    height: auto;
}
.header .header-nav .nav{
    display: inline-block;
    padding-left: 416px;
    font-size: 14px;
    /* font-family: 'alibaba-regular'; */
}
.header .header-nav .nav span{
    margin-right:48px;
    cursor: pointer;
}

.header .header-wrapper{
    width: 100%;
    padding-top: 70px;
    position: relative;
    height: 630px;
    z-index:1;
    overflow: hidden;
    cursor: pointer;
}
#img-list {
    width: 100%;
    display: flex;
    position: relative;
    height: 630px;
    background-color: #71adf7;
}
#img-list li{
    width: 100vw;
    height: 630px;
    background-position: center;
}
#img-list li:nth-child(1){
    background-image: url('../assets/image/icon_banner1.jpg');
}
#img-list li:nth-child(2){
    background-image: url('../assets/image/icon_banner2.jpg');
    display: none;
}
#img-list li:nth-child(3){
    background-image: url('../assets/image/icon_banner3.jpg');
    display: none;
}
#appearImg{
    animation: appearImg 3s;
}
@keyframes appearImg{
    0%{
        opacity: 0;
    }
    90%{
        opacity: 1;
    }
    100%{
        opacity: 0;
    }
}