How to use CSS3's flexbox to quickly achieve web page layout goals?

How to use CSS3’s flexbox to quickly achieve web page layout goals?

With the popularity of mobile devices and the increasing importance of web design, the flexibility and responsiveness of web layout have become the focus of designers. CSS3's flexbox has become a powerful tool to quickly achieve web page layout goals. Using flexbox, we can easily implement functions such as web page layout adaptation, alignment and sorting. This article will introduce the basic usage and common properties of flexbox, and how to use these properties to implement various web page layouts.

First, let us understand the basic usage of flexbox. Before using flexbox, we need to set up a container and place the items that need to be laid out in the container. The style of the container can be achieved by setting the display property to flex or inline-flex. Specifically, a container set to flex will arrange its children in the horizontal direction, while a container set to inline-flex will arrange its children in the vertical direction.

Next, we can achieve a more flexible layout by setting other properties of the container. Among them, the most commonly used attributes are flex-direction, justify-content and align-items.

The flex-direction property is used to specify the arrangement direction of items. The default value is row, which means horizontal arrangement. Other optional values ​​are row-reverse (horizontal arrangement in reverse order), column (vertical arrangement) and column-reverse (vertical arrangement in reverse order).

justify-content property is used to set the alignment of the item on the main axis. The default value is flex-start, which means left alignment. Other possible values ​​are flex-end (right-aligned), center (center-aligned), space-between (equal spacing between items), and space-around (equal spacing around items).

align-items property is used to set the alignment of items on the cross axis. The default value is stretch, which means stretch alignment. Other possible values ​​are flex-start (align top), flex-end (align bottom), center (align center), and baseline (align to the baseline of the first item).

In addition to the above properties, flexbox also provides some other properties, such as flex-wrap (controlling whether items wrap) and align-content (setting multiple rows or columns when there are multiple rows or columns) alignment). The specific usage of these attributes can be selected according to actual needs.

Next, we will use flexbox to implement several common web page layouts.

First, let’s implement a common header, content and bottom layout. We can set the header and bottom to a fixed height, and use the flex-grow property for the content to adapt to the remaining space. The specific code is as follows:

.container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.header {
  height: 100px;
  background-color: #ccc;
}

.content {
  flex-grow: 1;
  background-color: #fff;
}

.footer {
  height: 50px;
  background-color: #ccc;
}

Next, let’s implement a column layout, for example, the left column and the right column each occupy 50% of the width. We can set the flex-wrap property of the container to wrap and do this by setting the width of the sub-item. The specific code is as follows:

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

.left-column,
.right-column {
  width: 50%;
  background-color: #ccc;
}

Finally, let’s implement a center-aligned layout. We can achieve this by setting the justify-content property of the container to center and setting the margin in the subproject to auto. The specific code is as follows:

.container {
  display: flex;
  justify-content: center;
}

.item {
  margin: auto;
  width: 200px;
  height: 200px;
  background-color: #ccc;
}

Through the above examples, we can see the flexibility and powerful layout capabilities of flexbox. By setting simple attributes, we can achieve a variety of web page layout effects. Therefore, learning and mastering flexbox is an important step for designers to achieve their web page layout goals. I hope this article is helpful to you, and I wish you better results when using CSS3 flexbox!

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