.bg-body-tertiary {
  background-color: transparent !important;
}
.bg-body-tertiary .navbar-collapse {
  flex-grow: 0;
}
.navbar-brand img {
  width: 50%;
}
@media (max-width: 768px) {
  .carousel .carousel-item {
    height: 250px;
    font-weight: 100;
    color: #fff;
    text-align: center;
  }
  .carousel .up {
    margin-bottom: 10px;
    padding-top: 90px;
    line-height: 30px;
    font-size: 30px;
  }
  .carousel .down {
    margin: 0;
    line-height: 20px;
    font-size: 20px;
  }
}
@media (min-width: 768px) {
  .carousel .carousel-item {
    height: 400px;
    font-weight: 100;
    color: #fff;
    text-align: center;
  }
  .carousel .up {
    margin-bottom: 13px;
    padding-top: 140px;
    line-height: 50px;
    font-size: 50px;
  }
  .carousel .down {
    font-weight: 100;
    margin: 0;
    line-height: 30px;
    font-size: 30px;
  }
}
@media (min-width: 992px) {
  .carousel .carousel-item {
    height: 500px;
    font-weight: 100;
    text-align: center;
  }
  .carousel .up {
    margin-bottom: 16px;
    padding-top: 180px;
    line-height: 60px;
    font-size: 60px;
  }
  .carousel .down {
    margin: 0;
    line-height: 40px;
    font-size: 40px;
  }
}
.carousel .carousel-item {
  background-size: cover;
  background-position: center 0;
}
.carousel .carousel-item:nth-child(1) {
  background-image: url(../assets/images/没有数据.jpg);
}
.carousel .carousel-item:nth-child(2) {
  background-image: url(../assets/images/没有数据.jpg);
}
.carousel .carousel-item:nth-child(3) {
  background-image: url(../assets/images/没有数据.jpg);
}
.viewport {
  margin-top: 60px;
  text-align: center;
}
@media (max-width: 768px) {
  .viewport video {
    width: 375px;
  }
}
@media (min-width: 768px) {
  .viewport video {
    width: 720px;
  }
}
@media (min-width: 992px) {
  .viewport video {
    width: 1080px;
  }
}
@media (min-width: 1200px) {
  .viewport video {
    width: 1280px;
  }
}
@media (min-width: 1900px) {
  .viewport video {
    width: 1920px;
  }
}
.project {
  margin-top: 60px;
  text-align: center;
}
.project .row div {
  margin-bottom: 10px;
  height: 200px;
}
.project .row div p {
  display: block;
  height: 200px;
  background-color: green;
  border-radius: 4px;
  line-height: 350px;
  font-size: 20px;
  color: #fff;
}
.project .row div:nth-child(1) p {
  background-color: #70c3ff;
  background-size: cover;
}
.project .row div:nth-child(2) p {
  background-color: #fd6a7f;
  background-size: cover;
}
.project .row div:nth-child(3) p {
  background-color: #7f8ea0;
  background-size: cover;
}
.project .row div:nth-child(4) p {
  background-color: #89d04f;
  background-size: cover;
}