* {
  padding: 0;
  margin: 0;
}

html, body {
  width: 100%;
}

.container { 
  width: 100%;
  display: flex;
  flex-wrap: nowrap; /* 不换行，强制横向排列 */
}

.img-item {
  display: flex;
  flex: 1; /* 所有图片项等分容器宽度 */
  position: relative;
}

.lan-change {
  position: absolute;
  top: 30px;
  right: 30px;
  height: 30px;
  cursor: pointer;
  img {
    width: auto;
    height: 100%;
  }
}

img {
  width: 100%;
  margin: 0;
}