#detail_free_box__freearea.freearea {
    width: 100%;
    max-width: 688px;
    margin: 0 auto;
    display:flex;
    flex-direction: column;
}
@media screen and (max-width: 750px) {
.main img{
	max-width:100%;
}
}

#detail_free_box__freearea.freearea img{
    width: 100%;
    height: auto;
}