在Bootstrap 4的不同屏幕上将单行项目居中对齐

在Bootstrap 4中使用.align-items-*-center类在不同屏幕上的中心对齐单行项目。

让我们看看如何在小，中和大屏幕尺寸的中心对齐一行上的弹性项目-

在中间的小屏幕尺寸上对齐

<div class="d-flex flex-wrap align-items-sm-center bg-info" style="height:200px">
  <div class="p-2 border">Item 1</div>
  <div class="p-2 border">Item 2</div>
  <div class="p-2 border">Item 3</div>
  <div class="p-2 border">Item 4</div>
</div>

在中间的中等屏幕尺寸上对齐

<div class="d-flex flex-wrap align-items-md-center bg-info" style="height:200px">
  <div class="p-2 border">Item 1</div>
  <div class="p-2 border">Item 2</div>
  <div class="p-2 border">Item 3</div>
  <div class="p-2 border">Item 4</div>
</div>

在中心的大屏幕尺寸上对齐

<div class="d-flex flex-wrap align-items-lg-center bg-info" style="height:200px">
  <div class="p-2 border">Item 1</div>
  <div class="p-2 border">Item 2</div>
  <div class="p-2 border">Item 3</div>
  <div class="p-2 border">Item 4</div>
</div>

您可以尝试运行以下代码以在特定屏幕上的中心对齐单行项目-

示例

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Bootstrap Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
    <script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
  </head>
<body>
  <div class="container mt-3">
    <h1>Align Flex Items on a single row in the center</h1>
    <div class="d-flex flex-wrap align-items-center bg-info" style="height:200px">
      <div class="p-2 border">Item 1</div>
      <div class="p-2 border">Item 2</div>
      <div class="p-2 border">Item 3</div>
      <div class="p-2 border">Item 4</div>
    </div>
    <h2>Small Screen Size</h2>
    <div class="d-flex flex-wrap align-items-sm-center bg-secondary" style="height:200px">
      <div class="p-2 border">Item 1</div>
      <div class="p-2 border">Item 2</div>
      <div class="p-2 border">Item 3</div>
      <div class="p-2 border">Item 4</div>
    </div>
    <h2>Medium Screen Size</h2>
    <div class="d-flex flex-wrap align-items-md-center bg-info" style="height:200px">
      <div class="p-2 border">Item 1</div>
      <div class="p-2 border">Item 2</div>
      <div class="p-2 border">Item 3</div>
      <div class="p-2 border">Item 4</div>
    </div>
    <h2>Large Screen Size</h2>
    <div class="d-flex flex-wrap align-items-lg-center bg-info" style="height:200px">
      <div class="p-2 border">Item 1</div>
      <div class="p-2 border">Item 2</div>
      <div class="p-2 border">Item 3</div>
      <div class="p-2 border">Item 4</div>
    </div>
  </div>
</body>
</html>

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