.yokoku {
  color: #fff571;
  padding: 20px 30px 50px 30px;
  font-size: 30px;
  font-weight: bold;
  text-align: center;
}

.yokoku br {
  display: none;
}

@media screen and (max-width: 879px) {
  .yokoku {
    padding: 20px 10px 30px 10px;
    font-size: 19px;
    line-height: 1.6;
  }

  .yokoku br {
    display: inline;
  }
}