.c-key_cont {
  background-image: url("../img/key_pc.jpg");
  background-size: cover;
}
@media screen and (max-width: 767px) {
  .c-key_cont {
    background-image: url("../img/key_sp.jpg");
  }
}

@media screen and (min-width: 768px) {
  .flow .u-flex .c-txt_list {
    width: 49%;
  }
}
@media screen and (max-width: 767px) {
  .flow .u-flex .c-txt_list:not(:last-child) {
    margin-bottom: 6px;
  }
}
.flow .c-box_bg.-min {
  margin-top: 1em;
}