.plan {
  padding: 35px 0px;
}

.plan_01, .plan_02, .plan_03, .plan_04, .plan_05, .plan_06, .plan_07 {
  width: 192px;
  height: 183px;
}

@media screen and (max-width: 960px) {
  
  .plan_01,
  .plan_02,
  .plan_03,
  .plan_04,
  .plan_05,
  .plan_06,
  .plan_07 {
    width: 100%;
    height: auto;
    aspect-ratio: 64 / 61;
  }

  .plan {
    padding: 2% 0;
  }
  .plan li {
    width: 49%;
  }
}