Use:

# Parent
{
  display: table;
}

# Child
{
  display: table-cell;
  width: 100%; /* As large as its parent to center the text horizontally */
  text-align: center;
  vertical-align: middle; /* Vertically align this element on its parent */
}

添加行显示:table-cell;到该div的CSS内容。

只有表格单元格支持vertical-align: middle;，但是你可以把[table-cell]定义给div…

一个活生生的例子在这里:http://jsfiddle.net/tH2cc/

div{
    height: 90px;
    width: 90px;
    text-align: center;
    border: 1px solid silver;
    display: table-cell; /* This says treat this element like a table cell */
    vertical-align:middle; /* Now we can center vertically like in a TD */
}

这是非常简单的代码，为我工作!它只有一行，你的文本将水平居中。

.center-horizontally{
  justify-content: center;
}

<Card.Footer className="card-body-padding center-horizontally">
  <label className="support-expand-text-light">Call or email Customer Support to change</label>
</Card.Footer>

输出如下所示:

<div class="small-container">
    <span>Text centered</span>
</div>

<style>
.small-container {
    width:250px;
    height:250px;
    border:1px green solid;
    text-align:center;
    position: absolute;
    top: 50%;
    left: 50%;
    -moz-transform: translateX(-50%) translateY(-50%);
    -webkit-transform: translateX(-50%) translateY(-50%);
    transform: translateX(-50%) translateY(-50%);
}
.small-container span{
    position: absolute;
    top: 50%;
    left: 50%;
    -moz-transform: translateX(-50%) translateY(-50%);
    -webkit-transform: translateX(-50%) translateY(-50%);
    transform: translateX(-50%) translateY(-50%);
}
</style>

GRID

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

.center { 显示:网格; justify-items:中心; 对齐项目:中心; ｝ .box { 宽度:200 px; 身高:100 px; 背景:红色; ｝ <div class="box center">我的文本</div>

你可以尝试非常简单的代码:

  display: flex;
  align-items: center;
  justify-content: center;

.box { 身高:90 px; 宽度:90 px; 背景:绿色; 显示:flex; 对齐项目:中心; justify-content:中心; ｝ < div class = "盒子" > Lorem < / div >

代码依赖链接:http://codepen.io/santoshkhalse/pen/xRmZwr