.top_nav .nav>li:nth-of-type(4)>.nav_li_span>a {
    color: #1060CF;
}
.case_title_span{
    text-align: center;
    font-size: 30px;
    font-weight: bold;
    margin: 30px auto;
}
.case_title_span span{
    color: #1060CF;
}
.case_content{
    width: 80%;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}
.case_content_item{
    width: 30%;
    border: 1px solid #e5e5e5;
    border-radius: 5px;
}
.case_content_item_img img{
    width: 100%;
    height: 260px;
    position: relative;
    border-radius: 3px;
}
.case_content_item_text,.case_content_item_btn{
    margin: 10px;
}
.case_content_item_text{
    line-height: 28px;
    font-size: 20px;
    color: #111f2c;
    letter-spacing: 0;
    font-weight: 500;
}
.case_content_item_btn{
    font-size: 16px;
    color: rgba(17, 31, 44, .6);
    text-align: justify;
    line-height: 24px;
    height: 48px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;

}
.case_more div{
    margin: 40px auto ;
    width: 160px;
    height: 48px;
    border: 1px solid #08f;
    border-radius: 2px;
    line-height: 48px;
    font-size: 16px;
    color: #08f;
    text-align: center;
    font-weight: 400;
    -webkit-transition: all .2s;
    -moz-transition: all .2s;
    transition: all .2s;
    cursor: pointer;
}