您可以在 github 仓库中找到这篇文章中的所有代码。

您可以在此处查看垂直中心 - codesandbox 和水平中心的视觉效果。

---

通过 css 居中

---

垂直居中

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="x-ua-compatible" content="ie=edge" />
    <title>centering</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <p class="center-by-absolute-margin">centering</p>

    <p class="center-by-pseudo-class">centering</p>

    <p class="center-by-line-height">centering</p>

    <p class="center-by-table">centering</p>

    <div class="center-by-flex">
      <p>centering</p><div class="aritcle_card flexRow">
                                                        <div class="artcardd flexRow">
                                                                <a class="aritcle_card_img" href="/xiazai/skill12243" title="Github Codebase Inspection"><img
                                                                                src="https://img.php.cn/upload/skill/001/246/273/6adaf20d79f23518.jpg" alt="Github Codebase Inspection" ></a>
                                                                <div class="aritcle_card_info flexColumn">
                                                                        <a href="/xiazai/skill12243" title="Github Codebase Inspection">Github Codebase Inspection</a>
                                                                        <p>使用 pygount 检查代码库：统计代码行数（LOC）、编程语言及占比。</p>
                                                                </div>
                                                                <a href="/xiazai/skill12243" title="Github Codebase Inspection" class="aritcle_card_btn flexRow flexcenter"><b></b><span>下载</span> </a>
                                                        </div>
                                                </div><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p>
    </div>

    <div class="center-by-grid">
      <p>centering</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p>
    </div>

    <div class="center-by-absolute-parent">
      <p class="center-by-absolute-child">centering</p>
    </div>

    <p class="center-by-calc">centering</p>
  </body>
</html>

.center-by-absolute-margin {
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto 0;
}

.center-by-pseudo-class::before {
  content: "";
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}

.center-by-line-height {
  height: 200px;
  line-height: 200;
}

.center-by-table {
  display: table-cell;
  vertical-align: middle;
}

.center-by-flex {
  display: flex;
  align-items: center;
}

.center-by-grid {
  display: grid;
  align-items: center;
}

.center-by-absolute-parent {
  position: relative;
}

.center-by-absolute-child {
  position: absolute;
  top: 50%;
  transform: translatey(-50%);
}

.center-by-calc {
  height: 70px;
  position: relative;
  top: calc(50% - 35px);
}

---

水平居中

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="x-ua-compatible" content="ie=edge" />
    <title>centering</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <p class="center-by-fixed-width">centering</p>

    <p class="center-by-text-align">centering</p>

    <div class="center-by-unfixed-width">
      <span>centering</span>
    </div>

    <p class="center-by-table">centering</p>

    <div class="center-by-flex">
      <p>centering</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p>
    </div>

    <div class="center-by-grid">
      <p>centering</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p>
    </div>

    <div class="center-by-absolute-parent">
      <p class="center-by-absolute-child">centering</p>
    </div>

    <p class="center-by-calc">centering</p>
  </body>
</html>

.center-by-fixed-width {
  width: 70px;
  margin: 0 auto;
}

.center-by-text-align {
  text-align: center;
}

.center-by-unfixed-width {
  text-align: center;
}

.center-by-table {
  display: table;
  margin: 0 auto;
}

.center-by-flex {
  display: flex;
  justify-content: center;
}

.center-by-grid {
  display: grid;
  justify-content: center;
}

.center-by-absolute-parent {
  position: relative;
}

.center-by-absolute-child {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.center-by-calc {
  width: 70px;
  margin-left: calc(50% - 35px);
}