.box-design15 {
  margin: 20px auto;
  text-align: left;
}

.box-design15 p{
  text-align: left;
}

.box-design15-ttl {
  background-color: #ff0000;
  color: #fff;
  padding: 0.5em 20px;
  margin: 0;
  font-size: 20px;
  font-weight: bold;
}
.box-design15-txt {
  padding: 10px 20px;
  border: 2px solid #ff0000;
}