.page {
    width: 100%;
    height: auto;
    background: #fff;
    position: relative;
}

.iframeNav {
    width: 100%;
    height: 60px;
    position: absolute;
    z-index: 10;
    background-color: #fff;

}

.iframeNav iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.plan {
    width: 100%;
    height: 520px;
    background: url(../images/new_banner.png) no-repeat center center;
    background-size: 100% 100%;
    font-size: 90px;
    box-sizing: border-box;
    z-index: 1;
}

.cont {
    width: 1440px;
    height: auto;
    margin: 0 auto;
    box-sizing: border-box;
    padding: 50px 0 105px 0;
}

.img {
    width: 726px;
    height: 448px;
    background: url(../images/details.png) no-repeat center center;
    background-size: 100% 100%;
    margin: 40px auto;
}
@media screen and (min-width:1921px) and (max-width:2560px) {
   
    .plan{
        height: 620px;
    }
    
}