在父div中添加以下代码

display: grid;
place-items: center;

您可以尝试以下方法:

If you have a single word or one line sentence, then the following code can do the trick. Have a text inside a div tag and give it an id. Define the following properties for that id. id-name { height: 90px; line-height: 90px; text-align: center; border: 2px dashed red; } Note: Make sure the line-height property is same as the height of the division. Image But, if the content is more than one single word or a line then this doesn’t work. Also, there will be times when you cannot specify the size of a division in px or % (when the division is really small and you want the content to be exactly in the middle). To solve this issue, we can try the following combination of properties. id-name { display: flex; justify-content: center; align-items: center; border: 2px dashed red; } Image These 3 lines of code sets the content exactly in the middle of a division (irrespective of the size of the display). The "align-items: center" helps in vertical centering while "justify-content: center" will make it horizontally centered. Note: Flex does not work in all browsers. Make sure you add appropriate vendor prefixes for additional browser support.

对我来说，这是最好的解决方案:

HTML:

<div id="outer">
    <img src="logo.png">
</div>

CSS:

#outer {
  position: fixed;
  top: 50%;
  left: 50%;
  /* Bring your own prefixes */
  transform: translate(-50%, -50%);
}

<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>

.cell-row{显示:表;宽度:100%;身高:100 px;background - color: lightgrey;text-align:中心} .cell{显示:table-cell} .cell-middle {vertical-align: middle} < div class = " cell-row”> <div class="cell - cell-middle">Center</div> < / div >

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 */
}