.main-css {
  background-color: #f3f5f7;
  /* 高度为屏幕高度减去60px */
  height: 100vh;
}


.carousel {
  width: 100%;
  height: 100%;
  /* 设置轮播容器的高度 */
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  background-image: url('../img/image23.jpg');
  background-size: cover;
  background-position: center;
}


/* 小窗样式 */
.pre-view {
  height: 360px;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  flex-wrap: wrap;
  border-radius: 10px;
}

.pre-view-item {
  width: 300px;
  height: 340px;
  margin: 10px;
  border-radius: 10px;
  background-color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.pre-view-item:hover .sys-box {
  top: 0;
  transition: all 0.5s ease-in-out;
}



/* 系统小窗样式 */
.sys-box {
  width: 100%;
  height: 100%;
  position: absolute;
  top: calc(100% - 60px);
  transition: all 0.5s ease-in-out;
  background-color: rgba(22, 119, 255, 0.7);
}

.sys-title {
  font-size: 1.25rem;
  font-weight: bold;
  color: #fff;
  line-height: 3.75rem;
}

.sys-miao {
  font-size: 1rem;
  padding: 0 0.625rem;
  color: #fff;
}

.a-img {
  display: none;
}


/* 移动端样式 */
@media screen and (max-width: 768px) {
  .carousel {
    width: 100%;
    height: 1660px;
    /* 设置轮播容器的高度 */
    overflow-y: scroll;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: url('../img/image1425.jpg');
    background-size: cover;
    background-position: center;
    padding: 60px 0 20px 0;
  }

  .pre-view {
    height: 1600px;
    width: calc(100% - 20px);
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-wrap: wrap;
    border-radius: 10px;
  }

  .pre-view-item {
    width: calc(100% - 20px);
    height: 300px;
    margin: 10px;
    border-radius: 10px;
    background-color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    cursor: pointer;
  }
}