.def_lst {
  display: flex;
  flex-wrap: wrap;
}
.def_lst_dt {
  width: 20%;
  margin-bottom: 1.4rem;
}
.def_lst_dd {
  width: 80%;
  margin-bottom: 1.4rem;
}

@media screen and (max-width: 767px) {
  .def_lst {
    display: block;
  }
  .def_lst_dt {
    width: 100%;
    font-weight: bold;
    margin-bottom: .5rem;
  }
  .def_lst_dd {
    width: 100%;
    margin-bottom: 1.4rem;
  }
}