.u-section-1 {
  background-image: url("images/backgroundsky.jpg");
  background-position: 50% 50%;
}

.u-section-1 .u-sheet-1 {
  min-height: 779px;
}

@media (max-width: 1199px) {
  .u-section-1 .u-sheet-1 {
    min-height: 589px;
  }
}

@media (max-width: 991px) {
  .u-section-1 .u-sheet-1 {
    min-height: 442px;
  }
}

@media (max-width: 767px) {
  .u-section-1 .u-sheet-1 {
    min-height: 322px;
  }
}

@media (max-width: 575px) {
  .u-section-1 .u-sheet-1 {
    min-height: 189px;
  }
}

.iframe-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh; /* 设置容器的高度为视口高度，使其占据整个屏幕 */
  margin-top: -750px; /* 向上调整的距离，根据需要进行调整 */
}

/* 设置 <iframe> 元素的样式 */
.iframe-container iframe {
  width: 95%;
  height: 95%;
}