.box {
  text-align: center;
}
.box .box__paragraph {
  margin-top: 15px;
}
.box .box__rule {
  margin: 40px auto 0 auto;
  width: 30px;
  border-top: solid 1px #000;
}
.box .box__paragraph2 {
  margin-top: 20px;
  font-size: 1.57rem;
  line-height: 3.4em;
}

@media screen and (max-width: 767px) {
  .box .box__rule {
    margin: 20px auto 0 auto;
  }
  .box .box__paragraph2 {
    font-size: 1.21rem;
    line-height: 1.3em;
  }
}