search
HomeWeb Front-endCSS TutorialDetailed analysis of fixed positioning in CSS

Detailed analysis of fixed positioning in CSS

Dec 28, 2023 am 10:59 AM
css fixed positioningDetailed explanation of positioning attributes.

Detailed analysis of fixed positioning in CSS

Detailed explanation of the positioning attribute of fixed positioning in CSS

In CSS, fixed positioning (fixed positioning) is a commonly used positioning method, which can make elements relative to Position the browser window at a specific position and do not change the position as the page scrolls. This article details the positioning properties of fixed positioning and provides specific code examples.

There are two positioning attributes for fixed positioning, namely top and left. They are used to determine the position of the element relative to the upper left corner of the browser window.

  1. top attribute: used to define the position of the element relative to the top edge of the browser window. You can use pixel values, percentage values, or em values. The following is a sample code:
#fixed-element {
    position: fixed;
    top: 20px;
    left: 50%;
}

In the above code, the element with the id "fixed-element" is set to fixed positioning, and the distance from the top edge of the browser window is 20 pixels, horizontally Centered.

  1. left attribute: used to define the position of the element relative to the left edge of the browser window. You can also use pixel values, percentage values, or em values. The following is a sample code:
#fixed-element {
    position: fixed;
    top: 20px;
    left: 50%;
}

In the above code, the left attribute of the element is set to 50%, which means that the position of the element relative to the left edge of the browser window is half the width of the browser window.

It should be noted that if the width (width) and height (height) attributes of a fixed-positioned element are not set, its width will default to auto, and the height will also be automatically calculated.

In addition to the top and left attributes, fixed positioning can also be positioned using the right and bottom attributes. They are used in the same way as top and left, only the reference edges are different. The right attribute is used to define the position of the element relative to the right edge of the browser window, while the bottom attribute is used to define the position of the element relative to the bottom edge of the browser window.

The following is a complete fixed positioning example code:

<!DOCTYPE html>
<html>
<head>
<style>
#fixed-element {
    position: fixed;
    top: 20px;
    left: 50%;
    background-color: #f1f1f1;
    padding: 20px;
}
</style>
</head>
<body>

<p>Scroll down to see the effect of fixed positioning.</p>

<div id="fixed-element">
    <h2 id="This-is-a-fixed-element">This is a fixed element</h2>
    <p>This element will stay in its position even when scrolling.</p>
</div>

</body>
</html>

In the above code, the div element after the p element is set to fixed positioning, and the distance from the top edge of the browser window is 20 pixels, centered horizontally. Its background color is #f1f1f1 and its padding is 20 pixels.

By learning these fixed positioning positioning properties, you can position and layout elements more flexibly when designing web pages so that they maintain a fixed position when the page scrolls. At the same time, you can also combine other CSS properties and techniques to achieve more positioning effects.

I hope this article will be helpful to you and that you can flexibly apply the knowledge of fixed positioning in future page design.

The above is the detailed content of Detailed analysis of fixed positioning in CSS. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
So Many Color LinksSo Many Color LinksApr 13, 2025 am 11:36 AM

There's been a run of tools, articles, and resources about color lately. Please allow me to close a few tabs by rounding them up here for your enjoyment.

How Auto Margins Work in FlexboxHow Auto Margins Work in FlexboxApr 13, 2025 am 11:35 AM

Robin has covered this before, but I've heard some confusion about it in the past few weeks and saw another person take a stab at explaining it, and I wanted

Moving Rainbow UnderlinesMoving Rainbow UnderlinesApr 13, 2025 am 11:27 AM

I absolutely love the design of the Sandwich site. Among many beautiful features are these headlines with rainbow underlines that move as you scroll. It's not

New Year, New Job? Let's Make a Grid-Powered Resume!New Year, New Job? Let's Make a Grid-Powered Resume!Apr 13, 2025 am 11:26 AM

Many popular resume designs are making the most of the available page space by laying sections out in a grid shape. Let’s use CSS Grid to create a layout that

One Way to Break Users Out of the Habit of Reloading Too MuchOne Way to Break Users Out of the Habit of Reloading Too MuchApr 13, 2025 am 11:25 AM

Page reloads are a thing. Sometimes we refresh a page when we think it’s unresponsive, or believe that new content is available. Sometimes we’re just mad at

Domain-Driven Design With ReactDomain-Driven Design With ReactApr 13, 2025 am 11:22 AM

There is very little guidance on how to organize front-end applications in the world of React. (Just move files around until it “feels right,” lol). The truth

Detecting Inactive UsersDetecting Inactive UsersApr 13, 2025 am 11:08 AM

Most of the time you don’t really care about whether a user is actively engaged or temporarily inactive on your application. Inactive, meaning, perhaps they

Wufoo   ZapierWufoo ZapierApr 13, 2025 am 11:02 AM

Wufoo has always been great with integrations. They have integrations with specific apps, like Campaign Monitor, Mailchimp, and Typekit, but they also

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.