How to vertically center a div in css-HTML Tutorial-php.cn

Home

Web Front-end

HTML Tutorial

How to vertically center a div in css

php中世界最好的语言

Nov 27, 2017 am 09:54 AM

css center

If it is a div with a fixed height and width that is vertically centered on the web page, it must be very simple. I believe everyone can easily write it. But if it is a div with a fixed height and width, how to vertically center it? So how do these divs get vertically centered? In this article, I will summarize

Fixed height and width div vertically centered

enter image description here

Copy after login

As shown above, fixed height and width is very simple, the writing is as follows:

 position: absolute;
 left: 50%;
 top: 50%;
width:200px;
height:100px;
margin-left:-100px;
margin-top:-50px;

Copy after login

No fixed height and width How to vertically center a div

Method 1:

Use a "ghost" pseudo-element (invisible pseudo-element) and inline-block / vertical-align It can be done Centered, very clever. However, this method requires that the element to be centered is inline-block, which is not a truly universal solution.

html is as follows:

<div style="height: 300px;">
    <div>
        <h1>haorooms案例题目</h1>
        <p>haorooms案例内容，haorooms案例内容haorooms案例内容haorooms案例内容haorooms案例内容haorooms案例内容haorooms案例内容haorooms案例内容haorooms案例内容</p>
    </div>
</div>

Copy after login

css is as follows:

/* This parent can be any width and height */
.block {
  text-align: center;
}
/* The ghost, nudged to maintain perfect centering */
.block:before {
  content: &#39;&#39;;
  display: inline-block;
  height: 100%;
  vertical-align: middle;
  margin-right: -0.25em; /* Adjusts for spacing */
}
/* The element to be centered, can
   also be of any width and height */ 
.centered {
  display: inline-block;
  vertical-align: middle;
  width: 50%;
}

Copy after login

Method 2:

You can use the table layout method, but this method also has limitations!

The writing method is as follows:

<table style="width: 100%;">
  <tr>
     <td style="text-align: center; vertical-align: middle;">
          Unknown stuff to be centered.
     </td>
  </tr>
</table>

Copy after login

Since table writing is more time-consuming, you can also use div instead of table. The writing method is as follows:

html：

<div>
   <div>
       Unknown stuff to be centered.
   </div>
</div>
css:
.something-semantic {
   display: table;
   width: 100%;
}
.something-else-semantic {
   display: table-cell;
   text-align: center;
   vertical-align: middle;
}

Copy after login

Method 3 , The ultimate solution:

The above two methods may have their limitations. The third method I introduced is a more mature method of vertical centering that is not a fixed height and width div! But the method is written in CSS3. For children who want to be compatible with IE8, it is recommended to use the above method!

The method is similar to our fixed height and width, but without margin we use translate()

The demo is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>haorooms不固定高度div写法</title>
    <style>
.center {
  position: fixed;
  top: 50%;
  left: 50%;
  background-color: #000;
  width:50%;
  height: 50%;
-webkit-transform: translateX(-50%) translateY(-50%);
}
    </style>
</head>
<body>
    <div></div>
</body>
</html>

Copy after login

My css above is only for the webkit kernel Browser, other kernel browsers are written as follows:

-webkit-transform: translateX(-50%) translateY(-50%);
-moz-transform: translateX(-50%) translateY(-50%);
-ms-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);

Copy after login

Regarding the writing method of each browser, you can read my previous article: http://www.haorooms.com/post/css_common

Some pop-up layer styles can also be centered using this method

position: fixed;
top: 50%;
left: 50%;
width: 50%;
max-width: 630px;
min-width: 320px;
height: auto;
z-index: 2000;
visibility: hidden;
-webkit-backface-visibility: hidden;
-moz-backface-visibility: hidden;
backface-visibility: hidden;
-webkit-transform: translateX(-50%) translateY(-50%);
-moz-transform: translateX(-50%) translateY(-50%);
-ms-transform: translateX(-50%) translateY(-50%);
transform: translateX(-50%) translateY(-50%);

Copy after login

css3 variable width, high level, and vertical centering

As long as three sentences are needed, you can achieve variable width, high level, and vertical centering.

justify-content:center;//子元素水平居中
align-items:center;//子元素垂直居中
display:-webkit-flex;

Copy after login

Add the above three sentences to the parent element to achieve horizontal and vertical centering of the child elements.

Use margin:auto for vertical centering

The margin value is set to auto, which allows us to allocate the remaining space! We know that block-level elements are set to margin:0 auto; they can be displayed left, right, and centered! Is there any way to make the margin be centered on the top, bottom, left, and right after setting it to margin:auto? By centering the top, bottom, left and right, we can achieve our vertical centering!

The answer is yes, as long as we allow enough space at the top and bottom, we can let margin auto allocate the top and bottom space.

We can use positioning to give the margin enough space up, down, left, and right! Then you can use margin:auto to achieve vertical centering!

The implementation of html is as follows: (make a simple vertical pop-up box)

<div>
    <div></div>
</div>

Copy after login

css code is as follows, it is very simple and has good compatibility. It supports IE8+

.father{position:fixed;width:100%;height:100%;top;0;left:0;background-color:rgba(0,0,0,.7);}
.son{position: absolute;top:0;left:0;bottom:0;right:0;width:50%;height:50%;margin:auto;background-color:red;}

Copy after login

This way Vertical centering can be achieved. Isn’t it very simple? For more exciting content, please pay attention to other related articles on the php Chinese website!

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)

2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

How Long Does It Take To Beat Split Fiction?

1 months ago By DDD

R.E.P.O. Best Graphic Settings

2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Assassin's Creed Shadows: Seashell Riddle Solution

1 weeks ago By DDD

R.E.P.O. How to Fix Audio if You Can't Hear Anyone

2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Where is the login entrance for gmail email?

7403

Java Tutorial

1630

CakePHP Tutorial

1358

Laravel Tutorial

1268

PHP Tutorial

1218

Related knowledge

How to correctly display the locally installed 'Jingnan Mai Round Body' on the web page? Apr 05, 2025 pm 10:33 PM

Using locally installed font files in web pages Recently, I downloaded a free font from the internet and successfully installed it into my system. Now...

How to select a child element with the first class name item through CSS? Apr 05, 2025 pm 11:24 PM

When the number of elements is not fixed, how to select the first child element of the specified class name through CSS. When processing HTML structure, you often encounter different elements...

Does H5 page production require continuous maintenance? Apr 05, 2025 pm 11:27 PM

The H5 page needs to be maintained continuously, because of factors such as code vulnerabilities, browser compatibility, performance optimization, security updates and user experience improvements. Effective maintenance methods include establishing a complete testing system, using version control tools, regularly monitoring page performance, collecting user feedback and formulating maintenance plans.

How to make progress bar with h5 Apr 06, 2025 pm 12:09 PM

Create a progress bar using HTML5 or CSS: Create a progress bar container. Set the progress bar width. Create internal elements of the progress bar. Sets the internal element width of the progress bar. Use JavaScript, CSS, or progress bar library to display progress.

How to compatible with multi-line overflow omission on mobile terminal? Apr 05, 2025 pm 10:36 PM

Compatibility issues of multi-row overflow on mobile terminal omitted on different devices When developing mobile applications using Vue 2.0, you often encounter the need to overflow text...

What application scenarios are suitable for H5 page production Apr 05, 2025 pm 11:36 PM

H5 (HTML5) is suitable for lightweight applications, such as marketing campaign pages, product display pages and corporate promotion micro-websites. Its advantages lie in cross-platformity and rich interactivity, but its limitations lie in complex interactions and animations, local resource access and offline capabilities.

How to use the shape-outside attribute of CSS to achieve the display effect of gradually shortening text? Apr 05, 2025 pm 10:54 PM

Implementing the display effect of gradually shortening text In web design, how to achieve a special text display effect to make the text length gradually shortening? This effect...

Is H5 page production a front-end development? Apr 05, 2025 pm 11:42 PM

Yes, H5 page production is an important implementation method for front-end development, involving core technologies such as HTML, CSS and JavaScript. Developers build dynamic and powerful H5 pages by cleverly combining these technologies, such as using the <canvas> tag to draw graphics or using JavaScript to control interaction behavior.

See all articles