.case_banner_bg {
    background: url(../images/case_banner_bg.png) no-repeat center;
}
.case {
    padding: 80px 0 20px;
}
.case_item {
    padding-top: 40px;
}
.case_list li {
    position: relative;
    float: left;
    width: 500px;
    height: 300px;
    margin-bottom: 50px;
    border: 1px solid #009DA0;
    padding: 40px;
    box-sizing: border-box;

}
.case_list li:nth-child(odd) {
    margin-right: 75px;
}
.case_list li:nth-child(even) {
    margin-left: 75px;
}
.case_list li .positionImg {
   position: absolute;
   right: -50px;
   box-shadow:0px 0px 6px 0px rgba(224,224,224,0.8);
}
.font_con p:nth-child(1) {
    color: #102E2F;
    font-size:24px;
    line-height: 60px;

}
.font_con p:nth-child(2) {
    color: #808080;
    font-size:18px;
    margin-bottom: 10px;
    line-height: 28px;
}

h3.tit {
    display: inline-block;
    border-bottom: 1px solid #E3E3E3;
    
}
h6.sub_tit {
    display: block;
    color: #102E2F;
    font-size: 16px;
    line-height: 40px;
}
@media screen and (min-width:960px) and (max-width:1200px){
    .case_list li {
        width: 416px;
        height: 300px;
    }
    .case_list li:nth-child(odd) {
        margin-right: 50px
    }
    .case_list li:nth-child(even) {
        margin-left: 50px;
    }

}
@media screen and (min-width:760px) and (max-width:960px){
    .case_list li {
        width: 340px;
    }

}
@media screen   and (max-width:760px){
    .case_tit {
        text-align: center;
    }
    .case {
        padding: 30px 0 20px;
    }
    .case_list {
        margin: 0;
    }
    .case_list li {
        width: 290px;
        height: 226px;
        margin: 0 10px 20px;
    }
    .font_con p:nth-child(2) {
        line-height: 20px;
    }
    .case_list li:nth-child(even) {
        margin-left: 10px;
    }
    .case_list li .positionImg {
        width: 200px
    }
    .font_con p {
        line-height: 20px;
    }
    .font_con p:nth-child(1) {
        font-size: 14px;
    }
    .font_con p:nth-child(2) {
        font-size: 12px;
    }
    .case_item {
        padding-top: 20px;
    }
}