前端设计问题：iframe

居中问题：

尝试了一般的居中方法，无效果

   			display: flex;
            justify-content: center;
            align-items: center;

放到导航栏下面不居中

放到页面底部还是不居中

Code

    <iframe id="demo_sanshui" src="demo_sanshui.html" width="120%" height="100%" scrolling="no" frameborder="0"></iframe>

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link rel="stylesheet" href="./css/daoshi1.css" />

    <!-- 继承（相对定位） -->
    <script>
        window.parent.$(function() { // 使用 vindow.parent 调用父级 jquery
            var head = document.getElementsByTagName("head").item(0);

            var linkList = window.parent.document.getElementsByTagName("link"); // 获取父窗口 link 标签对象列表
            for (var i = 0; i < linkList.length; i++) {
                var _link = document.createElement("link");
                _link.rel = 'stylesheet';
                _link.type = 'text/css';
                _link.href = linkList[i].href;
                head.appendChild(_link);
            }
        });
    </script>
</head>

<body>
    <div class="column_wrapper" id="" data-spm="">
        <div class="nav2_ind04" id="">
            <div class="textTab" id="nav02" data-spm="EuhLU9mTLz1p" data-spm-max-idx="2">
                <div class="left">
                    <h3>
                        <a href="#" target="_blank" data-spm-anchor-id="C28340.PdNvWY0LYxCP.EuhLU9mTLz1p.1">精彩呈现</a
              >
            </h3>
          </div>

          <div class="clear"></div>
        </div>
        <div class="content" id="zbds_top" data-spm="EuhLU9mTLz1p">
          <div class="con">
            <ul style="margin-left: 0px">
              <li>
                <div class="li_con">
                  <div class="img">
                    <a href="table.html" target="_blank"
                      ><img h5-src="" src="./images/san.png" /><i>山水</i></a
                    >
                  </div>
                  <div class="title" id="time0">
                    <a href="" target="_blank">#三板片区综合服务站 02-23</a>
                </div>
                <div class="brief" id="title_0">
                    <a title="三板村“攻略”" href="https://www.jianpian.cn/a/cb4vwu5?sc=groupmessage&s_uid=2937179&a_uid=2937179&sd=1" target="_blank">三板村“攻略”</a
                    >
                  </div>
                </div>
                <span class="li_line"></span>
              </li>

              <li>
                <div class="li_con">
                  <div class="img">
                    <a href="#" target="_blank"
                      ><img h5-src="" src="./images/Flamingo.png" /><i
                        >鸟兽</i
                      ></a
                    >
                  </div>
                  <div class="title" id="time1">
                    <a
                      href="https://mp.weixin.qq.com/s/2Z3NfYj3eszgSWagNTsCLw"
                      target="_blank"
                      >#方志广东 2021-06-04</a
                    >
                  </div>
                  <div class="brief" id="title_1">
                    <a
                      title="新闻调查"
                      href="https://mp.weixin.qq.com/s/2Z3NfYj3eszgSWagNTsCLw"
                      target="_blank"
                      >千鸟翔集的岭南水乡</a
                    >
                  </div>
                </div>
                <span class="li_line"></span>
              </li>

              <li>
                <div class="li_con">
                  <div class="img">
                    <a href="" target="_blank"
                      ><img h5-src="" src="./images/政策解读.png" /><i
                        >政策</i
                      ></a
                    >
                  </div>
                  <div class="title" id="time2">
                    <a
                      href="http://dara.gd.gov.cn/snnyxxlb/content/post_3130231.html"
                      target="_blank"
                      >#南方日报 2020-11-19</a
                    >
                  </div>
                  <div class="brief" id="title_2">
                    <a
                      title="古村焕新记"
                      href="http://dara.gd.gov.cn/snnyxxlb/content/post_3130231.html"
                      target="_blank"
                      >古村焕新记</a
                    >
                  </div>
                </div>
                <span class="li_line"></span>
              </li>

              <li>
                <div class="li_con">
                  <div class="img">
                    <a href="#" target="_blank"
                      ><img
                        h5-src="./images/皮划艇.png"
                        src="./images/皮划艇.png"
                      /><i>人文</i></a
                    >
                  </div>
                  <div class="title" id="time3">
                    <a
                      href="https://www.sohu.com/a/722923449_121106875"
                      target="_blank"
                      >#珠海金湾 2023-09-23</a
                    >
                  </div>
                  <div class="brief" id="title_3">
                    <a
                      title="开门大吉-2023-43"
                      href="https://www.sohu.com/a/722923449_121106875"
                      target="_blank"
                      >丰收盛会水乡欢腾</a
                    >
                  </div>
                </div>
                <span class="li_line"></span>
              </li>

              <!-- 新增一个主题，但无法显示（失败） -->
              <!-- <li>
                <div class="li_con">
                  <div class="img">
                    <a href="" target="_blank"
                      ><img h5-src="" src="./images/政策解读.png" /><i
                        >改变</i
                      ></a
                    >
                  </div>
                  <div class="title" id="time4">
                    <a
                      href="http://dara.gd.gov.cn/snnyxxlb/content/post_3130231.html"
                      target="_blank"
                      >#南方日报 2020-11-19</a
                    >
                  </div>
                  <div class="brief" id="title_4">
                    <a
                      title="古村焕新记"
                      href="http://dara.gd.gov.cn/snnyxxlb/content/post_3130231.html"
                      target="_blank"
                      >古村焕新记</a
                    >
                  </div>
                </div>
                <span class="li_line"></span>
              </li> -->
            </ul>
          </div>
        </div>
      </div>
    </div>
  

    <script>
      window.parent.$(function () {  // 使用 vindow.parent 调用父级 jquery
      var body = document.getElementsByTagName("body").item(0);
  
      var scriptList = window.parent.document.getElementsByTagName("script");  // 获取父窗口 script 标签对象列表
      for (var i =0 ; i < scriptList.length; i++) {
          var _script = document.createElement("script");
          _script.type = 'text/script';
          _script.src = scriptList[i].src;
          body.appendChild(_script);
      }
  });
  </script>
  </body>
</html>

CSS

* {
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

body,
div,
p,
ul,
ol,
dl,
dt,
dd,
li,
form,
input,
table,
img,
h1,
h2,
h3,
h4,
h5,
h6 {
    margin: 0;
    padding: 0;
}

body {
    color: #222222;
    background: #fff;
    margin-top: 0;
    font-family: PingFangSC-Regular, Helvetica, Arial, Microsoft Yahei, sans-serif;
    margin: 0 auto;
    min-width: 1022px;
    background-repeat: no-repeat;
    background-position: center center;
}

a {
    color: #222222;
    text-decoration: none;
    /*outline: none;*/
}

ul,
ol {
    list-style-type: none;
}

em,
b,
i {
    font-style: normal;
}

ul:after,
ol:after {
    clear: both;
    content: ".";
    display: block;
    font-size: 0;
    height: 0;
    line-height: 0;
    visibility: hidden;
}

.clear {
    height: 0px;
    line-height: 0;
    font-size: 0;
    overflow: hidden;
    clear: both;
}


/*默认分辨率小于1279 ，内容宽度962*/

.column_wrapper {
    width: 1500px;
    margin: 0 auto;
    clear: both;
    position: relative;
}


/*标题栏*/

.textTab {
    clear: both;
    padding-bottom: 10px;
}


/* 直播导视 */

.nav2_ind04 .content {
    border-top: 2px solid #e5e5e5;
    padding: 0px 28px;
    position: relative;
}

.nav2_ind04 .content .con ul li {
    padding: 28px 0px 26px 0;
    float: left;
    position: relative;
}

.nav2_ind04 .content .con {
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.nav2_ind04 .content .con ul {
    width: 99999px;
}

.nav2_ind04 .content .con ul li .img i {
    font-size: 18px;
    color: #000000;
    line-height: 21px;
    font-weight: bold;
    margin-left: 10px;
}

.nav2_ind04 .content .con ul li .img a {
    width: 100%;
    display: block;
    line-height: 21px;
}

.nav2_ind04 .content .con ul li .title {
    font-size: 14px;
    line-height: 24px;
    margin: 5px auto 10px 0px;
    color: #222222;
}

.nav2_ind04 .content .con ul li .title a {
    color: #222222;
}

.nav2_ind04 .content .con ul li .brief {
    font-size: 14px;
    line-height: 24px;
    color: #222222;
    height: 42px;
}

.nav2_ind04 .content .con ul li .li_line {
    background: #0084ff;
    width: 186px;
    height: 2px;
    position: absolute;
    bottom: 0;
    left: 20px;
    display: none;
}

.nav2_ind04 .content .con ul li .brief a {
    color: #222222;
    display: block;
    width: 100%;
    height: 100%;
    line-height: 24px;
}

.nav2_ind04 .content .con ul li .li_con {
    border-right: 1px solid #e7e7e7;
    padding: 8px 20px 0px 20px;
    height: 104px;
    width: 186px;
}

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