.box-design04 {
  margin: 40px auto 50px;
  padding: 30px 20px 10px 20px;
  border: 5px solid #27c5d8;
  border-radius: 20px;
  text-align: center;
}

.box-design04-ttl {
  background-color: #27c5d8;
  color: #fff;
  border-radius: 80vh;
  padding: 15px 1.5em;
  margin: -55px 0 0 0;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  font-size: 24px;
  font-weight: bold;
  text-align: center;
}
.box-design04-ttl::after {
  content: '';
  position: absolute;
  bottom: -30px;
  left: 50%;
  transform: translateX(-50%);
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  border: 15px solid transparent;
  width: 0;
  height: 0;
  border-top-color: #27c5d8;
}
.sp_br {
  display: none; //768px以上では改行タグを無効に。
}
@media screen and (max-width: 768px) {
  .sp_br {
    display: block; //768px未満で改行タグを有効に。
  }
  .box-design04-ttl {
  font-size: 18px;
  }
}