.u-box-mainv {
  margin-bottom: 80px;
}

.teacher-title, .student-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-top: 100px;
  margin-bottom: 40px;
  text-align: center;
  line-height: 1.2;
  padding-top: 15px;
  padding-bottom: 15px;
  border-bottom: solid 2px #00AFEC;
  background-color: #E0F5FD;
}

.teacher-title .sub-title, .student-title .sub-title {
  color: #00AFEC;
  font-size: 70%;
}

.content-box {
  border: solid 1px lightgray;
  padding: 1.5em;
  margin: 1.5em 0;
  border-radius: 0.5em;
}

.content-box *:first-child {
  margin-top: 0;
}

.content-box .content-body {
  display: flex;
}

.content-box .content-body > * {
  margin-top: 0;
  margin-right: 2em;
}

.content-box .content-body > *:last-child {
  margin-right: 0;
}

.content-box .content-body .description {
  flex-grow: 2;
}

.content-box .thumb {
  max-width: 400px;
}

.content-box .thumb img {
  border: solid 1px gray;
}

.books .book-item {
  text-align: center;
}

.books .book-item .cover {
  border: solid 1px gray;
  box-shadow: 2px 2px 4px gray;
}

.kakomi-red {
  border: solid 1px crimson;
  color: crimson;
  padding: 0.2em 0.5em;
  font-size: 90%;
  font-weight: bold;
}
@media screen and (max-width: 767px) {
  .teacher-title, .student-title {
    font-size: 2.8rem;
    margin-top: 60px;
  }

  .content-box .content-body {
    flex-direction: column;
  }

  .content-box .content-body > * {
    margin-top: 1em;
    margin-right: 0;
  }

  .content-box .content-body > *:first-child {
    margin-top: 0;
  }

  .content-box .thumb img {
    width: 100%;
  }
}