.ciot-welcome {
  height: 700px;
  color: #fff;
  background: url('/resource/images/welcome-ciot-bg.jpg') center center no-repeat;
  background-size: auto 100%;
}

.ciot-features-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 45px;
}
.ciot-features-item img {
  width: 80px;
  height: 80px;
}

.ciot-cases-item {
  margin-bottom: 30px;
  border-radius: 5px;
  overflow: hidden;
  box-shadow: 0 8px 16px 0 rgb(0 0 0 / 10%);
  position: relative;
}
.ciot-cases-item .content {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 15px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: #fff;
  transition: all .3s;
  opacity: 0;
}
.ciot-cases-item .content:hover {
  background-color: rgba(0, 0, 0, .5);
  border-top-left-radius: 120px;
  border-bottom-right-radius: 120px;
  opacity: 1;
}