.header {
    width: 1200px;
    height: 500px;
    margin: 0 auto;
}

.nav-wrap {
    position: relative;
    top: 403px;
    left: 425px;
    height: 44px;
    width: 350px;
    display: flex;
    justify-content: space-between;
}

.nav-btn {
    display: block;
    width: 150px;
    height: 44px;
    background: url('../img/banner-1..png') no-repeat 100% 100%;
    text-decoration: none;
    outline: none;
}
.nav-btn:nth-child(2){
    background: url('../img/banner-1.png') no-repeat 100% 100%;
}
.img-btn {
    display: block;
    width: 300px;
    height: 68px;
    background: url('../img/jineng-1.png') no-repeat center center;
    margin: 0 auto;
}
.btn-second{
    background: url('../img/guanjia-1.png') no-repeat center center;
}
.btn-third{
    display: block;
    width: 320px;
    height: 68px;
    background: url('../img/baoxian-1.png') no-repeat center center;
    margin: 0 auto;
}
.btn-wrap {
    position: relative;
    width: 100%;
    margin: 0;
}
.wrap-1 {
    top: 310px;
}
.wrap-2 {
    top: 911px;
}
.wrap-3 {
    top: 413px;
}