.about {
  display: flex;
  justify-content: space-between;
}

.about .l {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 55%;
}

.about .r {
  width: 39%;
}

.about .r img {
  display: block;
  width: 100%;
  height: 100%;
}

.about_box {
  margin: 100px 0;
}

.about .l h4 {
  position: relative;
}

.about .l h4::after {
  content: "";
  position: absolute;
  bottom: 18%;
  left: 26%;
  display: block;
  width: 100px;
  height: 20px;
  background: #246BB3;
  z-index: -1;
}

.quality_content ul li {
  text-align: center;
  cursor: pointer;
}

.quality_content ul li i {
  font-size: 50px;
}

.quality_content ul li h4 {
  font-size: 22px;
}

.quality_content_text {
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 666px;
  height: 666px;
  box-sizing: border-box;
  background-image: url(../image/company_profile/circle\ \(1\).png);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  background-position: center center;
}

.quality_content_text .item_text {
  width: 50%;
  text-align: center;
}

.quality_content_text .item_text h4 {
  margin: 0 0 50px 0;
  font-size: 32px;
}

.quality_content ul li:nth-child(2) img {
  margin: 110px 0 0 0;
}


.quality_content ul li:nth-child(4) img {
  margin: 0 0 110px 0;
}

.quality_content ul li:nth-child(1),
.quality_content ul li:nth-child(3) {
  display: flex;
  align-items: center;
  justify-content: center;
}

.quality_content ul li:nth-child(1) img {
  margin: 0 0 0 110px;
}

.quality_content ul li:nth-child(3) img {
  margin: 0 110px 0 0;
}

.quality_content {
  margin: 200px 0 200px 0;
}

.quality_content ul {
  position: relative;
}

.quality_content ul li:nth-child(1) {
  position: absolute;
  top: 275px;
  left: 15%;
}

.quality_content ul li:nth-child(2) {
  position: absolute;
  top: -110px;
  left: 44.5%;
}

.quality_content ul li:nth-child(4) {
  position: absolute;
  bottom: -780px;
  left: 46%;
}

.quality_content ul li:nth-child(3) {
  position: absolute;
  top: 275px;
  right: 15%;
}

.quality_content ul li:hover {
  color: #246BB3;
  transition: 0.6s;
}

.quality_content .quality_content_text .item_text h4 {
  color: #246BB3;
}

/* .quality_content ul li:hover img {
  filter: drop-shadow(40px 0px yellow);
} */

.quality_content .quality_content_text .item_text {
  display: none;
}

@media screen and (max-width: 1680px) {

  /* about */
  .about_box {
    margin: 90px 0;
  }

  .about .l h4 {
    font-size: 36px;
  }

  .about .l span {
    font-size: 20px;
  }

  .quality_content .quality_content_text .item_text h4 {
    margin: 0 0 40px 0;
    font-size: 28px;
  }
}

@media screen and (max-width: 1600px) {

  /* about */
  .about_box {
    margin: 80px 0;
  }

  .about .l h4 {
    font-size: 32px;
  }

  .about .l span {
    font-size: 18px;
  }

  .quality_content .quality_content_text .item_text h4 {
    margin: 0 0 30px 0;
    font-size: 26px;
  }

  .quality_content ul li h4 {
    font-size: 20px;
  }

  .quality_content ul li:nth-child(1) {
    left: 10%;
  }

  .quality_content ul li:nth-child(3) {
    right: 10%;
  }
}

@media screen and (max-width: 1440px) {

  /* about */
  .about_box {
    margin: 70px 0;
  }

  .about .l h4 {
    font-size: 28px;
  }

  .about .l span {
    font-size: 16px;
  }

  .quality_content .quality_content_text .item_text h4 {
    margin: 0 0 20px 0;
    font-size: 24px;
  }

  .quality_content ul li h4 {
    font-size: 18px;
  }
}

@media screen and (max-width: 1366px) {

  /* about */
  .about_box {
    margin: 60px 0;
  }

  .about .l h4 {
    font-size: 26px;
  }

  .about .l span {
    font-size: 14px;
  }

  .quality_content .quality_content_text .item_text h4 {
    margin: 0 0 15px 0;
    font-size: 22px;
  }

  .quality_content ul li:nth-child(1) {
    left: 5%;
  }

  .quality_content ul li:nth-child(3) {
    right: 5%;
  }

  .quality_content ul li h4 {
    font-size: 16px;
  }
}

@media screen and (max-width: 1280px) {

  /* about */
  .about_box {
    margin: 50px 0;
  }

  .about .l h4 {
    font-size: 24px;
  }

  .quality_content .quality_content_text .item_text h4 {
    margin: 0 0 10px 0;
    font-size: 20px;
  }

  .quality_content ul li:nth-child(1) {
    left: 0%;
  }

  .quality_content ul li:nth-child(2) {
    position: absolute;
    top: -110px;
    left: 44.5%;
  }

  .quality_content ul li:nth-child(4) {
    position: absolute;
    bottom: -780px;
    left: 46%;
  }

  .quality_content ul li:nth-child(3) {
    right: 0%;
  }

  .quality_content ul li h4 {
    font-size: 14px;
  }
}

@media screen and (max-width: 1024px) {

  /* about */
  .about_box {
    margin: 40px 0;
  }

  .about .l h4 {
    font-size: 22px;
  }

  .quality_content ul li:nth-child(1) {
    left: -5%;
  }

  .quality_content ul li:nth-child(2) {
    position: absolute;
    top: -110px;
    left: 44.5%;
  }

  .quality_content ul li:nth-child(4) {
    position: absolute;
    bottom: -780px;
    left: 45%;
  }

  .quality_content ul li:nth-child(3) {
    right: -5%;
  }

  .quality_content .quality_content_text .item_text h4 {
    margin: 0 0 10px 0;
    font-size: 18px;
  }

  .quality_content .quality_content_text .item_text span {
    font-size: 16px;
  }
}

@media screen and (max-width: 980px) {

  /* about */
  .about_box {
    margin: 30px 0;
  }

  .about .l h4 {
    font-size: 20px;
  }

  .quality_content_text {
    width: 500px;
    height: 500px;
  }

  .quality_content ul li:nth-child(4) {
    bottom: -640px;
  }

  .quality_content ul li:nth-child(2) {
    left: 44.5%;
  }

  .quality_content ul li:nth-child(1),
  .quality_content ul li:nth-child(3) {
    top: 210px;
  }

  .quality_content .quality_content_text .item_text h4 {
    margin: 0 0 10px 0;
    font-size: 16px;
  }

  .quality_content .quality_content_text .item_text span {
    font-size: 14px;
  }
}

@media screen and (max-width: 768px) {

  /* about */
  .about_box {
    margin: 20px 0;
  }

  .about .l h4 {
    font-size: 18px;
  }

  .about {
    flex-wrap: wrap;
  }

  .about .l,
  .about .r {
    width: 100%;
  }

  .about .l h4::after {
    left: 15%;
  }

  .about .l span {
    display: block;
    margin: 10px 0;
    line-height: 1.5;
  }

  .quality_content ul li:nth-child(2) {
    left: 42.5%;
  }

  .quality_content ul li:nth-child(4) {
    left: 43.5%;
    bottom: -520px;
  }

  .quality_content_text {
    width: 400px;
    height: 400px;
  }

  .quality_content ul li:nth-child(1),
  .quality_content ul li:nth-child(3) {
    top: 175px;
  }

  .quality_content .quality_content_text .item_text span {
    line-height: 1.3;
  }
}

@media screen and (max-width: 640px) {

  /* about */
  .about_box {
    margin: 10px 0;
  }

  .about .l h4 {
    font-size: 16px;
  }

  .quality_content ul li:nth-child(1),
  .quality_content ul li:nth-child(2),
  .quality_content ul li:nth-child(3),
  .quality_content ul li:nth-child(4) {
    position: relative;
    top: 0;
    left: 0;
  }

  .quality_content ul {
    display: flex;
    justify-content: space-between;
  }

  .quality_content {
    margin: 20px 0;
  }

  .quality_content_text {
    width: 300px;
    height: 300px;
  }

  .quality_content ul li h4 {
    font-size: 12px;
  }

  .product_details_title h4::before {
    width: 30px;
  }

  .product_details_title h4::after {
    width: 30px;
  }
}

@media screen and (max-width: 375px) {}