.main_area {
  min-width: 1000px;
}

.main_contents {
  width: 770px;
  margin: 0 auto;
  background-color: #ffffff;
  border: 10px solid #e6f4f6;
  padding: 40px 0;
  margin-bottom: 50px;
}

.main_contents .contents_area {
  width: 660px;
  margin: 0 auto;
  line-height: 2;
}

.main_contents .contents_area h2, .main_contents .contents_area h3 {
  width: -webkit-fit-content;
  width: -moz-fit-content;
  width: fit-content;
  margin: 0 auto;
}

.main_contents .contents_area h2.margin_non, .main_contents .contents_area h3.margin_non {
  margin: 0;
}

.main_contents .contents_area h2.eye_fatigue, .main_contents .contents_area h3.eye_fatigue {
  -webkit-transform: translateY(-8px);
          transform: translateY(-8px);
  margin-bottom: 2px;
}

.img_box {
  margin-top: 30px;
  text-align: center;
}

.txt_area {
  width: 600px;
  margin: 0 auto;
  text-indent: 1em;
}

.mb30 {
  margin-bottom: 30px !important;
}

.mb50 {
  margin-bottom: 50px !important;
}

.mt0 {
  margin-top: 0px !important;
}