.plan-basic {
  background-color: #FFF;
  padding: 64px 16px 0 16px;
}

.plan-basic__header {
  font-size: 0;
  text-align: center;
}

.plan-basic__title {
  position: relative;
  color: #222;
  font-family: "YuMincho +36p Kana", "Noto Serif JP";
  font-size: 16px;
  font-style: normal;
  font-weight: 600;
  line-height: 28px; /* 175% */
  letter-spacing: 0.8px;
  text-align: center;
}

.plan-basic__title:after {
  content: '';
  width: 66px;
  height: 1px;
  display: inline-block;
  background-color: #222222;
  position: absolute;
  bottom: -2px;
  left: calc(50% - 33px);
}

@media screen and (min-width: 768px) {
  .plan-basic {
    padding: 64px 8px 20px 8px;
  }

  .plan-basic__title {
    font-size: 18px;
  }
}