.sub6_c1_box2{flex-wrap: wrap;}
.sub6_c1_box2>div{width:49.5%;margin:0 1% 1% 0}
.sub6_c1_box2>div:nth-child(2n){margin:0 0 1% 0}





@media screen and (min-width:768px){
    .sub6_c1_box2{flex-wrap: nowrap;}
    .sub6_c1_box2>div{width:25%;margin:0 1% 0 0}
    .sub6_c1_box2>div:nth-child(2n){margin:0 1% 0 0}
    .sub6_c1_box2>div:nth-child(4){margin:0}
}