A guide to CSS flexible layout properties: position sticky and flexbox

CSS Flexible Layout Property Guide: position sticky and flexbox

In modern web design, flexible layout has become a very popular and useful technology. It can help us create adaptive web page layouts so that web pages can display and respond well on different devices and screen sizes.

This article will focus on two flexible layout properties: position: sticky and flexbox. We will discuss their usage in detail and demonstrate their application through concrete code examples.

1. position: sticky

position: sticky is a powerful CSS property that allows elements to stay in a specific position when scrolling. Its usage is very simple. You only need to set position: sticky to the element and specify a top, bottom, left or right value to fix the element in a position relative to the view window.

Here is a specific example:

HTML code:

<div class="container">
  <div class="header">我是头部</div>
  <div class="content">我是内容</div>
  <div class="footer">我是尾部</div>
</div>

CSS code:

.container {
  height: 400px;
  overflow-y: scroll;
}

.header {
  position: sticky;
  top: 0;
  background-color: red;
}

.content {
  height: 1000px;
  background-color: yellow;
}

.footer {
  height: 200px;
  background-color: green;
}

In the above code, we create a container , the height of the container is 400px, and vertical scrolling is set. Then, we set the header element to sticky, anchoring it to the top of the container.

When we scroll the page in the browser, the header element will always remain at the top of the container and will not disappear as the page scrolls. This allows us to easily implement effects such as fixed navigation bars and title bars.

2. Flexbox

Flexbox is a flexible box model layout introduced by CSS3, which can make the layout of web pages more flexible and adaptive. With flexbox, we can easily control the position, size, and arrangement of elements in the container.

Here is a specific example:

HTML code:

<div class="container">
  <div class="box">盒子1</div>
  <div class="box">盒子2</div>
  <div class="box">盒子3</div>
</div>

CSS code:

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

.box {
  width: 100px;
  height: 100px;
  background-color: blue;
  margin: 10px;
}

In the above code, we create a container , and set its display property to flex, indicating that this is a flexbox container. We also use the justify-content attribute to set the horizontal alignment of the three child elements to space-between, so that the space between the child elements will be equal.

Each child element has its width and height set, its background color is blue, and its margins are set.

Through the above code, we have implemented a simple flexbox layout. The three box elements will automatically adjust their size and position to adapt to the size and needs of the container.

Summary:

This article introduces two very useful flexible layout properties: position: sticky and flexbox. position: sticky can help us achieve the scrolling fixed effect of elements, while flexbox can make the web page layout more flexible and adaptive. Through the above code examples, we can clearly understand the usage and effects of these two properties.

I hope this article can help everyone better understand and use these two elastic layout attributes, thereby bringing more convenience and flexibility to web design and development.

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