body {
    background-image: url('images/biz0.gif');
    /*background-repeat: no-repeat;*/
    /*background-size: cover;*/
    /*min-height: 100vh;*/
    /*display: flex;*/
    /*flex-direction: column;*/
    /*display: grid;*/
    /*grid-template-rows: auto 1fr auto;*/
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
header {
    background-image: url('images/biz3.gif');
    /*background-repeat: no-repeat;*/
    /*background-position: -center;*/
    /*background-size: cover;*/
    padding: 1px;
    text-align: center;
}
.menu-h3 {
    font-size: 1.2em; /* 设置字体大小为 H3 样式 */
    font-weight: bold; /* 设置字体粗细为粗体 */
    /*padding: 0 10px; */
}
.header-menu {
    background-image: url('images/biz3.gif');
    padding: 10px;
}
.content {
    flex: 1;
    padding: 0 20px; /* 设置容器的左右内边距 */
    /*border: 3px solid #000;*/
}
footer {
  
  /*background-repeat: no-repeat;*/
  /*background-position: center;*/
  /*background-size: cover;*/
  /*padding: 30px;*/
  text-align: center;
  /*position: fixed;*/
  /*bottom: 0;*/
  /*width: 100%;*/
  padding: 0 20px; /* 设置容器的左右内边距 */
}
.footer-content {
    /*border: 3px solid #000;*/
    background-image: url('images/biz3.gif'); /* 替换为你的页脚背景图片路径 */
    padding: 30px;
}