.content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.content ul {
  display: flex;
  justify-content: space-around;
  margin: 10px 0;
  padding: 10px 0;
  width: 100%;
  border-top: 1px solid #ededed;
  border-bottom: 1px solid #ededed;
}


.content h1 {
  margin: 10px 0;
}

.text_box {
  display: flex;
  flex-direction: column;
  width:100%;
  font-size: 18px;
    color: #000000;
    line-height: 3;
    text-align: justify;
}


.text_box span {

  width: 100%;
}

.unit_box {
  margin: 10px 0;
}

.unit_box .last,.unit_box .next {
  margin: 10px 0;
}

@media screen and (max-width: 768px) {
  .content_box {
    padding: 0 20px;
  }

  .unit_box {
    text-align: center;
  }
}