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html - 如何将浮动元素与容器中心对齐

问题描述

我正在学习前端开发。

我想在容器中间对齐矩阵和右侧列。我该怎么做呢？

我创建了以下内容（它是在反应中制作的，但这是原始 html）：

在此处输入图像描述

我想有一种方法可以用 HTML 和 CSS 做到这一点，但我不知道如何去做。我尝试将事物居中，但似乎不起作用。

<html lang="en">
  <head>
    <meta charset="utf-8" />
    <link rel="icon" href="/favicon.ico" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <meta name="theme-color" content="#000000" />
    <meta
      name="description"
      content="Web site created using create-react-app"
    />
    <link rel="apple-touch-icon" href="/logo192.png" />
    <!--
      manifest.json provides metadata used when your web app is installed on a
      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
    -->
    <link rel="manifest" href="/manifest.json" />
    <!--
      Notice the use of  in the tags above.
      It will be replaced with the URL of the `public` folder during the build.
      Only files inside the `public` folder can be referenced from the HTML.

      Unlike "/favicon.ico" or "favicon.ico", "/favicon.ico" will
      work correctly both with client-side routing and a non-root public URL.
      Learn how to configure a non-root public URL by running `npm run build`.
    -->
    <title>React App</title>
    <style type="text/css">
      body {
        margin: 0;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
          "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans",
          "Helvetica Neue", sans-serif;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
      }

      code {
        font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
          monospace;
      }
    </style>
    <style type="text/css">
      .App {
        text-align: center;
        width: 500px;
        margin: auto;
      }

      .matrix {
        float: left;
        display: grid;
        /* grid-template-columns: auto auto auto; */
        /* background-color: #2196f3; */
        padding: 10px;
      }

      .matrix-component {
        border-width: thin;
        border-style: solid;
        border-color: black;
        width: 50px;
        height: 50px;
      }

      .rhs {
        display: grid;
        padding: 10px;
        /* float: right; */
      }

      .content {
        background: grey;
      }
    </style>
  </head>
  <body>
    <noscript>You need to enable JavaScript to run this app.</noscript>
    <div id="root">
      <div class="App">
        <div class="content">
          <div>rows: <input />cols: <input /></div>
          <div class="matrix">
            <div>
              <input class="matrix-component" id="0" value="" /><input
                class="matrix-component"
                id="1"
                value=""
              /><input class="matrix-component" id="2" value="" />
            </div>
            <div>
              <input class="matrix-component" id="3" value="" /><input
                class="matrix-component"
                id="4"
                value=""
              /><input class="matrix-component" id="5" value="" />
            </div>
            <div>
              <input class="matrix-component" id="6" value="" /><input
                class="matrix-component"
                id="7"
                value=""
              /><input class="matrix-component" id="8" value="" />
            </div>
          </div>
          <div class="rhs">
            <input class="matrix-component" id="rhs0" value="" /><input
              class="matrix-component"
              id="rhs1"
              value=""
            /><input class="matrix-component" id="rhs2" value="" />
          </div>
        </div>
      </div>
    </div>
    <!--
      This HTML file is a template.
      If you open it directly in the browser, you will see an empty page.

      You can add webfonts, meta tags, or analytics to this file.
      The build step will place the bundled scripts into the <body> tag.

      To begin the development, run `npm start` or `yarn start`.
      To create a production bundle, use `npm run build` or `yarn build`.
    -->
    <script src="/static/js/bundle.js"></script>
    <script src="/static/js/0.chunk.js"></script>
    <script src="/static/js/main.chunk.js"></script>
    <script src="/main.65e0a7c3d67e68d31704.hot-update.js"></script>
  </body>
</html>

任何帮助深表感谢！

标签： htmlcssgridfrontend

解决方案

如今实现这种事情的最好方法（在我看来）是使用弹性盒子。因此，要完成您正在寻找的内容，请使用弹性框。这是css的实现。

首先让我们在你的 html 中像这样将每个列元素组合在一起。

<div class="new-div">
    <div>rows: <input />cols: <input /></div>
</div>
<div class="new-div2">
    <div class="matrix">
    <div>
        <input class="matrix-component" id="0" value="" /><input
        class="matrix-component"
        id="1"
        value=""
        /><input class="matrix-component" id="2" value="" />
    </div>
    <div>
        <input class="matrix-component" id="3" value="" /><input
        class="matrix-component"
        id="4"
        value=""
        /><input class="matrix-component" id="5" value="" />
    </div>
    <div>
        <input class="matrix-component" id="6" value="" /><input
        class="matrix-component"
        id="7"
        value=""
        /><input class="matrix-component" id="8" value="" />
    </div>
    </div>
    <div class="rhs">
    <input class="matrix-component" id="rhs0" value="" /><input
        class="matrix-component"
        id="rhs1"
        value=""
    /><input class="matrix-component" id="rhs2" value="" />
    </div>
</div>

那么这个css应该可以解决问题。

   .content{
        display:flex;
        justify-content:center;
        align-items:center;
        flex-direction:column;
    }

告诉我这是否能解决您的问题。您可以在此处阅读有关 flex-box 的更多信息。这是此解决方案的现场演示https://codepen.io/hileamlak/pen/bGpqLgb

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