.sub6_c4_box1{flex-wrap: wrap;margin:40px 0 0}
.sub6_c4_box1>div{width:49.5%;margin:0 1% 1% 0}
.sub6_c4_box1>div:nth-child(2n){margin:0 0 1% 0}


@media screen and (min-width:768px){

    
     
    .sub6_c4_box1>div{width:32.66666%;margin:0 1% 1% 0}
    .sub6_c4_box1>div:nth-child(2n){margin:0 1% 1% 0}
    .sub6_c4_box1>div:nth-child(3n){margin:0 0 1% 0 }
}