你可以添加float:none;保证金:汽车;样式化以使列内容居中。

Use:

<!-- unsupported by HTML5 -->
<div class="col-xs-1" align="center">

而不是

<div class="col-xs-1 center-block">

你也可以使用bootstrap 3 css:

<!-- recommended method -->
<div class="col-xs-1 text-center">

Bootstrap 4现在有将内容居中的伸缩类:

<div class="d-flex justify-content-center">
   <div>some content</div>
</div>

注意，默认情况下，它将是x轴，除非flex方向是列

Bootstrap 4/Bootstrap 5，水平和垂直对齐内容使用伸缩盒

<div class="page-hero d-flex align-items-center justify-content-center">
 <h1>Some text </h1>
</div>

使用引导类align-items-center和justify-content-center

.page-hero { 身高:200 px; 背景颜色:灰色; ｝ <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="匿名"> <div class="page-hero - d-flex align-items-center - align- content-center"> <h1>一些文本</h1> < / div >

没必要把事情复杂化。使用Bootstrap 4，您可以简单地使用边缘自动类my-auto在列内水平对齐项

         <div class="col-md-6 my-auto">
           <h3>Lorem ipsum.</h3>
         </div>

col- gl -4 col-md-6

 1. col-lg-4 ≥ 1200px (popular 1366, 1600, 1920+)
 2. col-md-6 ≥ 970px (popular 1024, 1200)
 3. col-sm-8 ≥ 768px (popular 800, 768)
 4. col-11 set default smaller devices for gutter (popular 600,480,414,375,360,312)
 5. mx-auto = always block center

如果上述工作都没有(就像在我的情况下试图居中输入)，我使用Boostrap 4偏移量:

<div class="row">
    <div class="col-6 offset-3">
        <input class="form-control" id="myInput" type="text" placeholder="Search..">
    </div>
</div>