If you need to use with the min-height property you must add this CSS on:

.outerContainer .innerContainer {
    height: 0;
    min-height: 100px;
}

CSS:

.vertical {
   display: table-caption;
}

Add this class to the element that contains the things you want to align vertically

You can use css flexbox.

.testimonialText {
  height: 500px;
  padding: 1em;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #b4d2d2;
}

<div class="testimonialText">
  Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
  in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
</div>

HTML

<div class="relative"><!--used as a container-->
    <!-- add content here to to make some height and width
    example:<img src="" alt=""> -->
    <div class="absolute">
        <div class="table">
            <div class="table-cell">
                Vertical contents goes here
            </div>
        </div>
    </div>
</div>

CSS

 .relative {
     position: relative;
 }
 .absolute {
     position: absolute;
     top: 0;
     bottom: 0;
     left: 0;
     right: 0;
     background: rgba(0, 0, 0, 0.5);
 }
 .table {
     display: table;
     height: 100%;
     width: 100%;
     text-align: center;
     color: #fff;
 }
 .table-cell {
     display: table-cell;
     vertical-align: middle;
 }

This works fine:

HTML

<div class="information">
    <span>Some text</span>
    <mat-icon>info_outline</mat-icon>
</div>

Sass

.information {
    display: inline-block;
    padding: 4px 0;
    span {
        display: inline-block;
        vertical-align: middle;
    }
    mat-icon {
        vertical-align: middle;
    }
}

Without and with the image tag <mat-icon> (which is a font).

This is another variation of the div in a div pattern using calc() in CSS.

<div style="height:300px; border:1px solid green;">
  Text in outer div.
  <div style="position:absolute; height:20px; top:calc(50% - 10px); border:1px solid red;)">
    Text in inner div.
  </div>
</div>

This works, because:

• position:absolute for precise placement of the div within a div
• we know the height of the inner div because we set it to 20px.
• calc(50% - 10px) for 50% - half the height for centering the inner div

This is the cleanest solution I have found (Internet Explorer 9+) and adds a fix for the "off by .5 pixel" issue by using transform-style that other answers had omitted.

.parent-element {
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.element {
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

Source: Vertical align anything with just 3 lines of CSS

Margin auto on a grid-item.

Similarly to Flexbox, applying margin auto on a grid-item centers it on both axes:

.container {
  display: grid;
}
.element {
  margin: auto;
}

A simple solution to an element of not knowing values:

HTML

<div class="main">
    <div class="center">
        whatever
    </div>
</div>

CSS

.main {
    position: relative
}

.center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
}

这是最适合单行文本的解决方案。

如果知道行数，它也可以对多行​​文本进行一些调整。

.testimonialText {
    font-size: 1em; /* Set a font size */
}
.testimonialText:before { /* Add a pseudo element */
    content: "";
    display: block;
    height: 50%;
    margin-top: -0.5em; /* Half of the font size */
}

这是一个JSFiddle。

您可以使用Flexbox在div中垂直对齐中心文本。

<div>
   <p class="testimonialText">This is the testimonial text.</p>
</div>

div {
   display: flex;
   align-items: center;
}

您可以在《 Flexbox完整指南》中了解更多信息。

<!DOCTYPE html>
<html>

  <head>
    <style>
      .container {
        height: 250px;
        background: #f8f8f8;
        display: -ms-flexbox;
        display: -webkit-flex;
        display: flex;
        -ms-flex-align: center;
        align-items: center;
        -webkit-box-align: center;
        justify-content: center;
      }
      p{
        font-size: 24px;
      }
    </style>
  </head>

  <body>
    <div class="container">
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    </div>
  </body>

</html>

试试这个，添加父div：

display: flex;
align-items: center;

It is easy with display: flex. With the following method, the text in the div will be centered vertically:

div {
  display: -webkit-flex;
  display: flex;
  align-items: center;
  /* More style: */
  height: 300px;
  background-color: #888;
}

<div>
  Your text here.
</div>

And if you want, horizontal:

div {
  display: -webkit-flex;
  display: flex;
  align-items: center;
  justify-content: center;
  /* More style: */
  height: 300px;
  background-color: #888;
}

<div>
  Your text here.
</div>

You must see the browser version you need; in old versions the code doesn’t work.

我使用以下内容轻松使随机元素垂直居中：

HTML：

<div style="height: 200px">
    <div id="mytext">This is vertically aligned text within a div</div>
</div>

CSS：

#mytext {
    position: relative;
    top: 50%; 
    transform: translateY(-50%);
    -webkit-transform: translateY(-50%);
}

这会将我中的文字div居中到200px高的external的确切垂直中间div。请注意，您可能需要使用浏览器前缀（例如-webkit-我的情况）才能使此功能适用于您的浏览器。

这不仅适用于文本，而且适用于其他元素。

您需要添加line-height属性，并且该属性必须与的高度匹配div。在您的情况下：

.center {
  height: 309px;
  line-height: 309px; /* same as height! */
}

<div class="center">
  A single line.
</div>

实际上，您可能会height完全删除该属性。

不过，这仅适用于一行文本，因此请小心。

CSS中的垂直居中
http://www.jakpsatweb.cz/css/css-vertical-center-solution.html

文章摘要：

对于CSS 2浏览器，可以使用display:table/ display:table-cell来使内容居中。

JSFiddle也提供了一个示例：

div { border:1px solid green;}

<div style="display: table; height: 400px; overflow: hidden;">
  <div style="display: table-cell; vertical-align: middle;">
    <div>
      everything is vertically centered in modern IE8+ and others.
    </div>
  </div>
</div>

可以将旧浏览器（Internet Explorer 6/7）的hack合并为样式，并#用于从较新的浏览器中隐藏样式：

div { border:1px solid green;}

<div style="display: table; height: 400px; #position: relative; overflow: hidden;">
  <div style=
    "#position: absolute; #top: 50%;display: table-cell; vertical-align: middle;">
    <div style=" #position: relative; #top: -50%">
      everything is vertically centered
    </div>
  </div>
</div>