.header-bottom {
    height: 4.3rem;
}

.header header {
    background-color: #1f323e;
}

.banner {
    position: relative;
    width: 100%;
    height: 31.25rem;
    padding-top: 11.25rem;
    text-align: center;
    background: url('http://static.web3di.com/img/6_pic12@2x.jpg') no-repeat center;
    background-size: 100% 100%;
    color: #ffffff;
}

.banner h4 {
    font-size: 3.125rem;
    color: #ffffff;
}

.play {
    margin-top: 3rem;
    margin-bottom: 5.125rem;

}

.play img {
    width: 4.375rem;
    height: 4.375rem;
}

.banner-nav {
    height: 3.125rem;
}

.banner-nav ul {
    width: 32.25rem;
    display: flex;
    margin: 0 auto;
}

.banner-nav li {
    line-height: 3.125rem;
    width: 10.75rem;
    text-align: center;
}

.banner-nav li:first-child {
    background: linear-gradient(90deg, rgba(51, 102, 255, 1) 0%, rgba(51, 153, 254, 1) 100%);
}

.banner-nav li:hover {
    background: linear-gradient(90deg, rgba(51, 102, 255, 1) 0%, rgba(51, 153, 254, 1) 100%);
}
/* .news-content {
    width: 75rem;
    margin: 0 auto;
} */
.news {
    width: 88.75rem;
    margin: 0 auto;
}
.return {
    height: 5.1875rem;
    line-height: 5.1875rem;
    font-size: .875rem;
    color: #3385FF;
}
.return a{
    color: #3385FF;
}
.news-title {
    text-align: center;
    color:rgba(0,0,0,1);
    margin-bottom: 2.375rem;
}
.news-title h3{
    font-size: 2.25rem;
    margin-bottom: 1.875rem;
    font-weight: normal;
}
.news-title p {
    font-size: .875rem;
    color:rgba(153,153,153,1)
}
.new-content {
    text-align: center;
    font-size: 1rem;
    color: #666666;
}
.new-content p {
    text-align: left;
}
.new-content p ,
.new-content img {
    line-height:1.9rem;
    margin-bottom: 0.5rem;
}
.new-content img{
    max-width:100% !important;
}
body{
    background: #f9f9f9;
}
.all-content{
    padding-bottom: 3rem;
    display: flex;
}
.content-left{
    background: #ffffff;
    width: 48.75rem;
    padding: 1.875rem;
}
.content-right{
     width: 18.75rem;
     margin-left: 1rem;
 }
.content-side{
     width: 18.75rem;
     margin-right: 1rem;
 }
.content-new{
    background: #ffffff;
    padding: 1.3125rem;
    margin-bottom: 1.25rem;
}
.article-title{
    border-bottom: 1px solid #ccc;
    padding-bottom: 2rem;
}
.article-title h4{
    font-size: 1.25rem;
    font-weight: 500;
}
.article-item li{
    font-size: .875rem;
    white-space: nowrap;
    margin-top: 1.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
}
.article-item li::before{
    content: "●";
    color: rgb(51,133,255);
    margin-right: .5rem;
}
.article-item li a{
    color: #000;
}
.single-info{
    margin:2.125rem 0;
}
.single-info a{
    padding: 0.75rem;
    border: 1px solid #dddddd;
    color: #3385FF;
    line-height:4.5rem;
}
#nav-single{
    display: flex;
    padding: 1.5rem 0;
    border-top: 1px solid #E8E8E8;
    border-bottom: 1px solid #E8E8E8;
}
#nav-single .nav-previous,#nav-single .nav-next{
    width:50%;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    font-size:1rem;
}
#nav-single a{
    color: #3385FF;
}

@media screen and (max-width: 750px) {
    .content-side{
        display: none;
    }
    .content-right{
        display: none;
    }
    .content-left{
        max-width: 100%;
    }
    .recommend-content{
        display: none;
    }
    .banner {
        width: 46.875rem;
        height: 15rem;
        padding-top: 4.25rem;
    }
    .news {
        padding:2.875rem 0;
    }
    .banner h4 {
        margin-bottom: 2.25rem;
    }
    .play {
        display: none;
    }
    .banner-nav {
        height: 4.375rem;
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
    }
    .banner-nav ul {
        width: 100%;
        height: 4.375rem;
        line-height: 4.375rem;
    }
    .banner-nav ul li {
        width: 15.625rem;
        line-height: 4.375rem;
    }
    .news {
        width: 41.875rem;
    }
    .return {
        display: none;
    }
    .news-title {
        margin-bottom: 2.125rem;
    }
    .news-title h3 {
        margin-bottom: 1rem;
    }
    
}