*{
    margin:0;
    padding:0;
}
html, body {
    height: 100%;
}
.header {
    background-color: #07031b;
    width:100%;
    height: 116px;
    padding-left:32px;
}
.header-menu {
    font-size: 30px;
    font-family: SimHei;
    word-spacing: -5px;
    letter-spacing: 0px;
    padding: 0 15px;
}
.nav-link{
    color:#818181 !important;
}
.nav-link:hover{
    color:#fefefe !important;
    cursor:pointer;
}
.custom_nav{
     background-color:#07031b !important;
}
.main{
    height: calc(100% - 116px);
}
.start{
    margin-left:200px;
}
.maincontent{
    padding: 0 10%; 
    margin-top: 50px;
}
@media screen and (max-width: 960px){
    .maincontent{
        padding: 0 8%;
        margin-top: 10px;
    }
    .img{
        width: 70%;
    }
}
@media screen and(min-width: 960px){
    .custom_nav{
        height:116px;
    }
}
.background {
    width: 100%;
    height: 100%;
    background: url("background.jpg") no-repeat center 0;
    background-size: 100% auto;
}
.background3 {
    width: 100%;
    height: 100%;
    background: url("background-3.jpg") no-repeat center 0;
    background-size: 100% auto;
}
.background2 {
    width: 100%;
    height: 100%;
    background: url("background-2.jpg") no-repeat center 0;
    background-size: 100% auto;
}