How to use CSS3’s flexbox technology to achieve even distribution of web content?

With the development of web design, people have higher and higher requirements for web page layout. In order to achieve even distribution of web content, CSS3's flexbox technology has become a very effective solution. This article will introduce how to use flexbox technology to achieve even distribution of web content, and give some practical examples.

1. What is flexbox technology
Flexbox (flexible layout) is a newly added layout mode in CSS3. It provides a flexible way to arrange, align and allocate space for elements. Using flexbox technology, we can easily achieve even distribution of web page content without resorting to complex styles and additional code.

2. Use flexbox to achieve even distribution of web content
The following are some methods of using flexbox technology to achieve even distribution of web content.

1. Set the display attribute of the parent container to flex
   First, we need to set the display attribute of the parent container to flex, so that the child elements in the parent container will be arranged according to the flexible box model. You can use the following code to achieve this:

.container {
display: flex;
}

2. Use the flex attribute to allocate the remaining space
   Default In this case, the child elements will be allocated according to their own width or height. However, we can use the flex property to specify the allocation ratio of child elements. The flex attribute can contain a numeric value indicating the proportion of child elements allocated. Here is an example:

.item {
flex: 1;
}

In this example, if there are 3 child elements in the container, they will Distribute the width of the parent container evenly.

3. Use the justify-content attribute for alignment
   When using flexbox layout, we can use the justify-content attribute to align child elements. justify-content has multiple values, such as flex-start, center, flex-end, etc. Here is an example:

.container {
justify-content: space-between;
}

In this example, the child elements will be in the parent container Distributed horizontally, aligned with the start and end of the parent container, the space within it will be evenly distributed.

4. Use the align-items attribute for vertical alignment
   In addition to horizontal alignment, we can also use the align-items attribute for vertical alignment. align-items also has multiple values, such as flex-start, center, flex-end, etc. The following is an example:

.container {
align-items: center;
}

In this example, the child elements will be vertical in the parent container Center aligned.

3. Example Demonstration
The following are some practical examples to demonstrate how to use flexbox technology to achieve even distribution of web content.

1. Equal-height layout
   Using flexbox technology, you can easily implement equal-height layout, even if the height of the child elements is inconsistent. Here is an example:

.container {
display: flex;
}

.item {
flex: 1;
border: 1px solid black;
}

In this example, each child element in the container will be evenly distributed with the height of the container, regardless of the height of the child element.

2. Grid Layout
   Using flexbox technology, you can also implement grid layout, that is, arrange sub-elements into a grid with multiple rows and columns. Here is an example:

.container {
display: flex;
flex-wrap: wrap;
}

.item {
flex : 0 0 33.33%;
border: 1px solid black;
}

In this example, the child elements in the container will be arranged according to a layout of 3 columns per row, and each child element The width is 1/3 of the width of the parent container.

4. Summary
Using CSS3’s flexbox technology, we can easily achieve even distribution of web content. By setting the display attribute of the parent container to flex, proportional distribution of the flex attribute of the child elements, and alignment using the justify-content and align-items attributes, we can achieve various effects such as equal height layout and grid layout. I hope the content of this article is helpful to you, please leave a message in the comment area to communicate!

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