.part_1{
    padding-bottom:20px;
}
.part_1 img{
    margin:30px  auto 0;
}
.title1 h5{
    margin:30px 0;
}
.part_2{
    width: 100%;
    height: auto;
    background:url("../images/s_img_2_bg.png") no-repeat center center;
}
.part_4{
    padding-bottom:70px;
}
.part_4_ctt{
    width: 100%;
    margin: 0 auto;
}

.part_4_ctt li{
    float:left;
    width: 530px;
    height: 161px;
    padding:60px 18px 30px 18px;
    font-size:18px;
    color:#666;
    margin: 0 20px;

}

.part_4_ctt .part_4_img1{
    margin-bottom: 20px;
    background:url("../images/s_img_5.png") no-repeat left top;
}
.part_4_ctt .part_4_img2{
    margin-bottom: 20px;
    background:url("../images/s_img_6.png") no-repeat left top;
}
.part_4_ctt .part_4_img3{
    background:url("../images/s_img_7.png") no-repeat left top;
}
.part_4_ctt .part_4_img4{
    background:url("../images/s_img_8.png") no-repeat left top;
}




/* 小屏电脑 */
@media screen and (min-width: 992px) and (max-width: 1199px) {

    .part_4_ctt .part_4_img3{
        margin-bottom: 20px;
    }
    .part_4_ctt{
        width: 530px;
        margin: 0 200px;
    }
}

/* pad */
@media screen and (min-width: 768px) and (max-width: 991px) {

    .part_4_ctt .part_4_img3{
        margin-bottom: 20px;
    }

    .part_4_ctt{
        width: 530px;
        margin: 0 75px;
    }

}

/* 手机端 */
@media screen and (min-width:320px) and (max-width:767px) {

}