.top_top{width: 75.125rem;margin: 0 auto;margin-top: 5.125rem;display: flex;
    height: 110.125rem;
}

.content{
    width: 100%;
}
.content_nav{
    width: 14.875rem;
    height: 78rem;
    background: #0069cb;
    /*padding-top: 0.75rem;*/
    margin-right: 0.875rem;
}
.content_ul{
    /*width: 11.875rem;*/
    /*background: #0fdae1;*/
    background: linear-gradient(-90deg,#85efff,#4dacfe);
    text-align: center;
    color: white;
    height:8.75rem;
    /*line-height: 8.75rem;*/
}
.content_p{
    font-size: 1.5rem;
    padding-top: 2.875rem;
}
.content_pp{
    font-size: 1.125rem;
    padding-top: 1.125rem;
}
/*.content_nav li a:first-of-type{width: 11.875rem;background: #0fdae1;font-size: 1.4rem;line-height: 4.375rem;}*/
.content_nav li a{font-size: 1.125rem;padding-left: 0.75rem;line-height: 3rem;}
/*.content_nav li a:nth-child(2){margin-top: 1.625rem;}*/
.content_nav li :hover{background: #0fdae1;}
iframe{
    flex: 1;
    background: white;
    margin: 0;
    border: 0;
}
.content_nav li a{
    display: block;
    color: #fff;
    text-decoration: none;

}
#aa,#bb{line-height: 2.25rem;width: 11.875rem;font-size: 1rem;}

@media only screen and (max-width:400px) {

    .content_nav {
        display: none;
    }

    .top_top {
        width: auto;
        margin-top: unset;

    }

    #top {
        height: unset;
    }

    .top_top {
        height: 48rem;
    }

    body, html {
        overflow-x: hidden;
        height: auto

    }

    .footer_product {
        position: relative;
    }
    .content_nav{
        height: unset;
    }
}