为什么这两个元素会重叠？ CSS 问题

Question

很难弄清楚为什么这两个 html 元素重叠。下面是各个元素的 HTML 和 CSS 文件。我在这里搜索了很多线程，但 none 的解决方案有效。谢谢！

main.css:

    #titlesection {
  height: auto;
  width: 100%;
  margin: auto;
  padding: 0px;
  margin-top: 25px;
  margin-bottom: 25px;
  position: absolute;
  display: block;
}

#contentdiv {
  top: 30%;
  left: 2%;
  width: 97%;
  margin: auto;
  height: 100%;
  position: absolute;
  display: block;
}

#title {
  padding-top: 50px;
  text-align: center;
  font-size: 60px;
  letter-spacing: 6px;
  display: block;
  margin-bottom: 1%;
  height: auto;
}

#titlesubheading {
  margin-top: 10px;
  margin-bottom: 10px;
  font-size: 30px;
  text-align: center;
  letter-spacing: 7px;
  display: block;
  height: auto;
}

#socialmedia {
  width: 97%;
  display: block;
}

#smtable {
  width: 10%;
  float: right;
}

#aboutheader {
  width: 95%;
  margin: auto;
  margin-top: 5%;
  padding: 10px;
  font-size: 30px;
  display: block;
  position: static;
}

#about {
  width: 95%;
  margin: auto;
  margin-top: 1%;
  padding: 0px;
  height: auto;
  font-size: 20px;
  display: block;
}

#abouttext {
  width: 60%;
  height: auto;
  display: block;
  margin-left: 10px;
  min-height: 140px;
}

index.html :

<body>
    <section id="titlesection">
      <div id="title">
        Abdullah Rehmat
      </div>
      <div id="titlesubheading">
        Freelance Developer
      </div>
      <div id="socialmedia">
        <table id="smtable">
          <tbody>
            <tr>
              <td class="a">
                <a href="mailto: rehmat.dev@gmail.com">
                  <img
                    src="{{url_for('static', filename='images/email.png')}}"
                    width="33"
                    height="33"
                  />
                </a>
              </td>
              <td class="a">
                <a href="https://twitter.com/ARehmat20" target="_blank">
                  <img
                    src="{{url_for('static', filename='images/twitter0.svg')}}"
                    width="50"
                    height="50"
                  />
                </a>
              </td>
              <td class="a">
                <a href="https://github.com/10CodeDev" target="_blank">
                  <img
                    src="{{url_for('static', filename='images/github.png')}}"
                    width="30"
                    height="30"
                  />
                </a>
              </td>
            </tr>
          </tbody>
        </table>
      </div>
    </section>

    <div id="contentdiv">
      <div id="aboutheader">
        About:
      </div>

这是问题的图片。 aboutheader 与 titlesubheading 重叠：

Answer 1

这是因为您将这两个元素都设为 position: absolute;。您可以通过删除来修复它。将您的 CSS 更新为：

编辑：同样供您参考，position 允许您在特定上下文中重新定位元素。 position: absolute; 从页面左上角定位一个元素，或者如果其父元素有 position: relative; 则从该元素定位。 position: relative; 将某物从其初始位置重新定位。

然后您可以使用 top、left、right 或 bottom 来选择如何重新定位项目。

#titlesection {
  height: auto;
  width: 100%;
  margin: auto;
  padding: 0px;
  margin-top: 25px;
  margin-bottom: 25px;
  position: relative;
  display: block;
}

#contentdiv {
  top: 0;
  left: 0;
  width: 97%;
  margin: auto;
  height: 100%;
  position: relative;
  display: block;
}

#title {
  padding-top: 50px;
  text-align: center;
  font-size: 60px;
  letter-spacing: 6px;
  display: block;
  margin-bottom: 1%;
  height: auto;
}

#titlesubheading {
  margin-top: 10px;
  margin-bottom: 10px;
  font-size: 30px;
  text-align: center;
  letter-spacing: 7px;
  display: block;
  height: auto;
}

#socialmedia {
  width: 97%;
  display: block;
}

#smtable {
  width: 10%;
  float: right;
}

#aboutheader {
  width: 95%;
  margin: auto;
  margin-top: 5%;
  padding: 10px;
  font-size: 30px;
  display: block;
  position: static;
}

#about {
  width: 95%;
  margin: auto;
  margin-top: 1%;
  padding: 0px;
  height: auto;
  font-size: 20px;
  display: block;
}

#abouttext {
  width: 60%;
  height: auto;
  display: block;
  margin-left: 10px;
  min-height: 140px;
}

Answer 2

ou can use the CSS position property in combination with the z-index property to overlay an individual div over another div element. The z-index property determines the stacking order for positioned elements

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