How to center an image in html-Front-end Q&A-php.cn

How to center an image in html

PHPz

Release： 2023-04-25 13:51:42

Original

50111 people have browsed it

HTML language is an indispensable part of web design and development. Pictures, as one of the essential elements in web pages, are widely used. However, we sometimes find that when we insert a picture, the picture is not in the center of the web page, which obviously affects the design effect. So, how do you center the image?

To center the image, you need to master some knowledge of HTML code and CSS styles. Let’s learn more about it below.

Method 1: Use HTML code

In the web page, we can use HTML language to control the position of the image so that it is centered. The specific implementation method is as follows:

Create a picture element in HTML, for example:

<img src="图片路径" class="center">

Copy after login

Add the "center" style in the class attribute. Styles can be added directly in the HTML file or using class selectors in the CSS file. As follows:

In the HTML file:

<style>
    .center {
        display: block;
        margin: auto;
    }
</style>

Copy after login

In the CSS file:

.center {
    display: block;
    margin: auto;
}

Copy after login

Method 2: Use CSS styles

CSS styles are also One of the common methods to center the image is as follows:

Add a wrapping layer to the img tag.

<div class="wrapper">
  <img src="图片路径">
</div>

Copy after login

Add styles to the wrapping layer in the CSS file.

.wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
}

Copy after login

In the above code, display: flex; is used to change the content layout of the web page to Flex layout, justify-content: center; is used to center the image horizontally, align-items: center; Used to vertically center the image, height: 100%; used to adapt the image height.

In order to make the above code more specific and intuitive, we will learn more through examples below.

Example 1:

First, add the following code to the HTML file:

<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>图片水平居中</title>
      <style>
         #centerImage {
            display: block;
            margin: 0 auto;
         }
      </style>
   </head>
   <body>
      <img id="centerImage" src="https://picsum.photos/id/42/400/400">
   </body>
</html>

Copy after login

In the above code, the image is located in the div element, and the id of the div is "centerImage" . In the CSS style sheet, we use "display: block;". This style can turn the image into a block element; and the "margin: 0 auto;" format can center the image horizontally. When we put these styles into the image's wrapping layer, we can center the image horizontally.

Example 2:

HTML code:

<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>图片垂直水平居中</title>
      <style>
         .wrapper {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
         }
         img {
            border: 1px solid #ccc;
         }
      </style>
   </head>
   <body>
      <div class="wrapper">
         <img src="https://picsum.photos/id/123/400/400">
      </div>
   </body>
</html>

Copy after login

In this code snippet, we create a wrapping layer div and add styles to it in the CSS style sheet, using Flex layout is used, and "justify-content: center;" is used to center the image horizontally, and "align-items: center;" is used to center the image vertically. The "height: 100vh;" attribute is used to adapt to the image height.

Summary:

Although centering the picture may seem like a trivial matter, in actual development and design, it is an extremely important and common problem. In this article, we introduce to you two methods to center the image, one is to use HTML tags and CSS styles, and the other is to use CSS styles. Each method has its own advantages and disadvantages, and programmers can choose the appropriate method according to the actual situation to achieve the beautiful effect of web design.

The above is the detailed content of How to center an image in html. For more information, please follow other related articles on the PHP Chinese website!