.about-banner {
  /* height: 480px; */
  background: url("../images/aboutimg1.jpg") no-repeat center;
}

.about-banner h3 {
  max-width: 1200px;
  margin: 126px auto 0;
  font-size: 1.8rem;
  font-weight: 400;
  color: #fff;
  display: block;
  padding: 70px 0 110px 0;
  position: relative;
}

.about-banner h3::before {
  content: url("../images/xia.png");
  position: absolute;
  top: 110px;
  left: 0;
}

.about-content {
  max-width: 1180px;
  margin: 50px auto 0;
}
.about-title {
  font-size: 1.8rem;
  font-weight: 400;
  color: #113a6c;
  display: flex;
  justify-content: center;
  position: relative;
}

.about-title::before {
  content: url("../images/xxx.png");
  position: absolute;
  top: 50px;
  left: 47.5%;
}

.about-grid {
  margin-top: 70px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  justify-self: center;
  text-align: justify;
}

.about-testing-site {
  width: 100%;
  background: url("../images/aboutimg17.jpg") no-repeat center;
  padding: 20px 0;
  text-align: center;
  margin-top: 80px;
}

.about-testing-site-title {
  font-size: 1.8rem;
  font-weight: 400;
  color: #fff;
  display: flex;
  justify-content: center;
  position: relative;
}

.about-testing-site-title::before {
  content: url("../images/xia.png");
  position: absolute;
  top: 50px;
  left: 48.5%;
}

.about-testing-item img {
  border: 10px solid #e6e6e7;
}

@media (max-width: 1024px) {
  .about-banner h3 {
    margin: 126px auto 0 60px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    margin: 70px 80px 0;
  }

  .about-testing-site {
    background: url("../images/aboutimg17.jpg") repeat;
  }
}

@media (max-width: 480px) {
  .about-banner {
    height: 160px;
  }
  .about-banner h3 {
    margin: 80px 0 0 30px;
    font-size: 1.4rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    margin: 70px 20px 0;
  }

  .about-title::before {
    left: 44%;
  }

  .about-testing-site-title::before {
    left: 44%;
  }
}