.about_us {
  max-width: 1280px;
  margin: 0 auto;
  overflow: hidden;
}
/* banner */
.banner {
  /* max-width: 1920px; */
  width: 100%;
  margin: 0 auto;
  position: relative;
}
.banner img {
  width: 100%;
}
/* btn_box */
.btn_box {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}
.btn_box .btn {
  width: 115px;
  height: 49px;
  border: 0;
  display: block;
}
.contact_us {
  background-image: url('../images/projects_case/contact_us.png');
}
.live_msg {
  background-image: url('../images/projects_case/live_msg.png');
  margin-top: 2px;
}
/* 公司介绍 */
.about_us .title {
  padding-top: 61px;
  padding-bottom: 12px;
  font-size: 36px;
  color: #4A90E2;
  letter-spacing: 5px;
  text-align: center;
  border-bottom: 2px solid #4A90E2;
}
.about_us .info {
  width: 1280px;
  padding-top: 61px;
  overflow: hidden;
  display: flex;
  justify-content: flex-start;
  align-items: center;
}
.about_us .left {
  width: 565px;
  height: 440px;
  position: relative;
}
.about_us .left .m_pulse_box {
  width: 565px;
  height: 388px;
  overflow: hidden;
  position: absolute;
  left: 29px;
  z-index: 9;
}
.about_us .left .model {
  width: 565px;
  height: 388px;
  position: absolute;
  left: 27px;
  background: #ffffff;
  z-index: 8;
}
.about_us .left .border {
  width: 565px;
  height: 388px;
  border: 8px solid #0B3880;
  position: absolute;
  top: 27px;
  right: 0;
  box-sizing: border-box;
}
.about_us .right {
  width: 623px;
  font-family: PingFangSC-Regular;
  font-size: 18px;
  color: #333333;
  line-height: 30px;
  margin-left: 53px;
}
.about_us .right p {
  text-indent: 36px;
}

/* 资质荣誉 */
.hornor {
  max-width: 1280px;
  margin:0 auto;
  margin-top: 79px;
  overflow: hidden;
}
.hornor  .title {
  font-size: 36px;
  color: #4A90E2;
  letter-spacing: 5px;
  text-align: center;
  border-bottom: 2px solid #4A90E2;
  padding-bottom: 12px;
}

.hornor .list {
  margin-top: 61px;
  margin-bottom: 135px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.hornor .list li {
  border: 2px solid #E5E5E5;
  padding: 12px;
}

.hornor .list li {
  margin-bottom: 35px;
}

.hornor .list li + li {
  margin-left: 38px;
}

.hornor .list li:nth-child(5) {
  margin-left: 0;
}