@media screen and (max-width: 819px) {
  .m-boxDef-box .m-maxImg-center .m-maxImg{
    width: 120px;
  }
}

@media screen and (min-width: 820px) {
  .m-boxDef-box .m-maxImg-center .m-maxImg{
    width: 200px;
  }
}