.a02 {
  border-bottom: 0;
  position: relative;
  text-align: center;
}

.a02__inner::after {
  background: -webkit-gradient(linear, left top, right top, from(#d71c1c), to(#ad1457));
  background: linear-gradient(to right, #d71c1c, #ad1457);
  bottom: 0;
  content: '';
  height: 0.125rem;
  left: 50%;
  position: absolute;
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
  width: 4rem;
}

.a02__inner .block__intro {
  color: #1d2533;
  font-size: 1rem;
  line-height: 1.5rem;
}

@media screen and (min-width: 48em) {
  .a02__inner .block__intro {
    font-size: 1rem;
    line-height: 1.5rem;
  }
}

@media screen and (min-width: 48em) and (min-width: 48em) {
  .a02__inner .block__intro {
    font-size: 1.3125rem;
    line-height: 2rem;
  }
}