.flex-row {
  display: flex;
  flex-direction: row;
}

.flex-column {
  display: flex;
  flex-direction: column;
}

.flex-space-around {
  display: flex;
  flex-direction: row;
  justify-content: space-around;
}

.img-100-100-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.pos_relative {
  position: relative;
}

.titleStyle {
  font-size: 3.75rem;
  line-height: 5.625rem;
}

.subtitleStyle {
  font-size: 1.5rem;
  line-height: 2.25rem;
}

@media screen and (max-width: 476px) {
  .titleStyle {
    font-size: 2.25rem;
    line-height: 3.375rem;
  }
  .subtitleStyle {
    font-size: 1.375rem;
    line-height: 2.0625rem;
  }
}
#introduce {
  padding-bottom: 200px;
}
#introduce h1 {
  width: 115px;
  height: 115px;
  font-size: 40px;
  border: 1px solid #b4d6dc;
  display: flex;
  justify-content: center;
  align-items: center;
  letter-spacing: 3px;
  -webkit-writing-mode: tb;
  writing-mode: tb;
  position: relative;
  left: 50%;
  transform: translateX(-75%);
  top: 50px;
}
#introduce h2 {
  color: #73a4aa;
  margin: 0 auto 100px;
  text-align: center;
  font-size: 42px;
}
#introduce .title {
  width: 60%;
  margin: 20px auto;
  color: #437488;
  font-weight: 500;
  font-size: 22px;
}
#introduce p {
  width: 60%;
  margin: 0 auto;
  font-size: 18px;
}
#introduce p span {
  display: block;
}
#introduce p span.subtitle {
  color: #437488;
  margin-top: 20px;
}
#introduce p.decorate {
  color: #437488;
  text-align: center;
  margin-bottom: 50px;
  font-weight: 500;
}
#introduce p.extraimg {
  position: relative;
}
#introduce p.extraimg:before {
  content: url("../img/service/dental_implants_1.png");
  position: absolute;
  right: -250px;
  top: -270px;
}
#introduce img {
  width: 60%;
}
#introduce img.icon {
  width: 150px;
  display: block;
  object-fit: contain;
  margin: 150px auto 40px;
}
#introduce img.table {
  width: 80%;
  margin: 100px auto;
  display: block;
}
#introduce img.demo {
  width: 80%;
  margin: 50px auto;
  display: block;
}
#introduce img.small {
  width: 400px;
  object-fit: contain;
  display: block;
  margin: 0 auto;
}
#introduce img.md {
  display: block;
}
#introduce img.xs {
  display: none;
}
#introduce ul {
  margin: 25px 0;
}
#introduce ul#process li {
  margin: 0 10px;
}
#introduce ul#process li img {
  width: 100%;
}
#introduce #danger {
  margin-bottom: 50px;
}
#introduce #danger ul {
  margin: 0;
  flex-wrap: wrap;
}
#introduce #danger ul lI {
  width: 20%;
  padding: 0 10px;
  margin: 10px 0;
}
#introduce .md {
  display: block;
}
#introduce .xs {
  display: none;
}
#introduce .dentalImplants-demo {
  display: block;
}
#introduce .dentalImplants-demo-phone {
  display: none;
}

#symptom img,
#danger img {
  width: 100%;
  object-fit: contain;
}

@media screen and (max-width: 768px) {
  #introduce {
    padding: 0 0 100px 0;
  }
  #introduce h1 {
    width: 115px;
    height: 115px;
    font-size: 40px;
    border: 1px solid #b4d6dc;
    display: flex;
    justify-content: center;
    align-items: center;
    letter-spacing: 3px;
    -webkit-writing-mode: tb;
    writing-mode: tb;
    position: relative;
    left: 50%;
    transform: translateX(-75%);
    top: 50px;
  }
  #introduce h2 {
    color: #73a4aa;
    margin: 0 auto 50px;
    text-align: center;
    font-size: 30px;
  }
  #introduce .title {
    width: 80%;
    margin: 20px auto;
    color: #437488;
    font-weight: 500;
    font-size: 18px;
  }
  #introduce p {
    width: 80%;
    margin: 0 auto;
    font-size: 18px;
  }
  #introduce p span {
    display: block;
  }
  #introduce p span.subtitle {
    color: #437488;
    margin-top: 20px;
  }
  #introduce p.decorate {
    color: #437488;
    text-align: left;
    margin-bottom: 20px;
    font-weight: 500;
  }
  #introduce img {
    width: 100%;
  }
  #introduce img.icon {
    width: 150px;
    display: block;
    object-fit: contain;
    margin: 100px auto 40px;
  }
  #introduce img.table {
    width: 100%;
    margin: 50px auto;
    display: block;
  }
  #introduce img.demo {
    width: 80%;
    margin: 50px auto;
    display: block;
  }
  #introduce img.small {
    width: 400px;
    object-fit: contain;
    display: block;
    margin: 0 auto;
  }
  #introduce img.md {
    display: none;
  }
  #introduce img.xs {
    display: block;
  }
  #introduce img.teeth_small {
    width: 80%;
  }
  #introduce ul {
    margin: 50px 0;
  }
  #introduce ul#process {
    flex-wrap: wrap;
    justify-content: center;
  }
  #introduce ul#process li {
    width: 30%;
    margin: 10px 1%;
  }
  #introduce ul#process li img {
    width: 100%;
  }
  #introduce #danger {
    margin: 0 auto !important;
  }
  #introduce #danger ul {
    margin: 0 0 50px;
    padding: 0;
  }
  #introduce #danger ul lI {
    width: 50%;
    padding: 0 10px;
    margin: 10px 0;
  }
  #introduce .md {
    display: none;
  }
  #introduce .xs {
    display: block;
    margin-bottom: 50px;
  }
  #introduce .xs img {
    width: 60%;
    margin: 30px auto;
    display: block;
    object-fit: contain;
  }
  #introduce .xs ~ h2 {
    width: 80%;
    text-align: left;
    font-size: 18px;
  }
  #introduce .xs ~ h2 ~ img {
    width: 100%;
  }
  #introduce .dentalImplants-demo {
    display: none;
  }
  #introduce .dentalImplants-demo-phone {
    display: block;
  }
  #symptom,
  #danger {
    width: 90%;
    margin: 50px auto !important;
    flex-wrap: wrap;
  }
  #symptom li,
  #danger li {
    margin-bottom: 20px;
  }
  #symptom li img,
  #danger li img {
    width: 100%;
    object-fit: contain;
  }
  #danger ul {
    margin-bottom: 20px;
    flex-wrap: wrap;
  }
}