How to set a transparent background in html: 1. Directly use "backgroud:rgba(R,G, B, A)" to set a transparent background. 2. First use the "backgroud: color value;" style to set the background color; then use the "opacity: transparency value" style to add a transparency to the background color.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
htmlSet transparent background
There are two ways to set transparent background color in html: one is to set it through rgba method, The other is through background and opacity settings.
1. RGB method
The so-called RGBA color is the three primary colors of RGB plus ALPHA. Provides transparency properties while adding color to the background.
Usage:
background:rgba(R,G, B, A);
Red (R): represents the red component of the color, an integer between 0 and 255 (percentage 0% ~ 100% can also be used) .
Green (G): represents the green component in the color, an integer between 0 and 255 (percentage 0% ~ 100% can also be used).
Blue (B): represents the blue component of the color, an integer between 0 and 255 (percentage 0% ~ 100% can also be used).
Transparency (A): represents transparency, ranging from 0 (completely transparent) to 1 (completely opaque).
Let’s take a look at a specific example of setting the background color transparency through rgba:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
div{
width: 200px;
height: 200px;
line-height: 30px;
text-align: center;
margin: 0 auto;
}
.div1{
background: rgba(220, 38, 38, 1);
}
.div2 {
background: rgba(220, 38, 38, 0.2);
}
</style>
</head>
<body>
<div class="div1">背景颜色，没有设置透明度</div><br />
<div class="div2">背景颜色，设置了透明度</div>
</body>
</html>Rendering:
1. Set the background color to be transparent through background and opacity
The attribute value in the background attribute is relatively simple, so I won’t go into details here. Let’s take a brief look here. Opacity attribute
The "opacity" of the opacity attribute parameter is represented by a number, ranging from 0.0 to 1.0. Fully transparent is 0.0, and fully opaque is 1.0. In other words, the larger the number, the more opaque the element is.
In addition to the "opacity" parameter, there is also inherit to inherit the parent layer properties. However, browser support is poor and it is not recommended to use it.
After reading the introduction of the two attributes, let's look at the specific example of setting the background color transparency through backgroud and opacity
The code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
div {
width: 200px;
height: 200px;
line-height: 30px;
text-align: center;
margin: 0 auto;
border: 1px solid #ccc;
}
.div1 {
background: red;
}
.div2 {
background: red;
opacity: 0.2;
}
</style>
</head>
<body>
<div class="div1">背景颜色，没有设置透明度</div><br />
<div class="div2">背景颜色，设置了透明度</div>
</body>
</html>Rendering:
Recommended tutorial: CSS video tutorial
Recommended online manual: css online manual
The above is the detailed content of How to set transparent background in html. For more information, please follow other related articles on the PHP Chinese website!
HTML and React's Integration: A Practical GuideApr 21, 2025 am 12:16 AMHTML and React can be seamlessly integrated through JSX to build an efficient user interface. 1) Embed HTML elements using JSX, 2) Optimize rendering performance using virtual DOM, 3) Manage and render HTML structures through componentization. This integration method is not only intuitive, but also improves application performance.
React and HTML: Rendering Data and Handling EventsApr 20, 2025 am 12:21 AMReact efficiently renders data through state and props, and handles user events through the synthesis event system. 1) Use useState to manage state, such as the counter example. 2) Event processing is implemented by adding functions in JSX, such as button clicks. 3) The key attribute is required to render the list, such as the TodoList component. 4) For form processing, useState and e.preventDefault(), such as Form components.
The Backend Connection: How React Interacts with ServersApr 20, 2025 am 12:19 AMReact interacts with the server through HTTP requests to obtain, send, update and delete data. 1) User operation triggers events, 2) Initiate HTTP requests, 3) Process server responses, 4) Update component status and re-render.
React: Focusing on the User Interface (Frontend)Apr 20, 2025 am 12:18 AMReact is a JavaScript library for building user interfaces that improves efficiency through component development and virtual DOM. 1. Components and JSX: Use JSX syntax to define components to enhance code intuitiveness and quality. 2. Virtual DOM and Rendering: Optimize rendering performance through virtual DOM and diff algorithms. 3. State management and Hooks: Hooks such as useState and useEffect simplify state management and side effects handling. 4. Example of usage: From basic forms to advanced global state management, use the ContextAPI. 5. Common errors and debugging: Avoid improper state management and component update problems, and use ReactDevTools to debug. 6. Performance optimization and optimality
React's Role: Frontend or Backend? Clarifying the DistinctionApr 20, 2025 am 12:15 AMReactisafrontendlibrary,focusedonbuildinguserinterfaces.ItmanagesUIstateandupdatesefficientlyusingavirtualDOM,andinteractswithbackendservicesviaAPIsfordatahandling,butdoesnotprocessorstoredataitself.
React in the HTML: Building Interactive User InterfacesApr 20, 2025 am 12:05 AMReact can be embedded in HTML to enhance or completely rewrite traditional HTML pages. 1) The basic steps to using React include adding a root div in HTML and rendering the React component via ReactDOM.render(). 2) More advanced applications include using useState to manage state and implement complex UI interactions such as counters and to-do lists. 3) Optimization and best practices include code segmentation, lazy loading and using React.memo and useMemo to improve performance. Through these methods, developers can leverage the power of React to build dynamic and responsive user interfaces.
React: The Foundation for Modern Frontend DevelopmentApr 19, 2025 am 12:23 AMReact is a JavaScript library for building modern front-end applications. 1. It uses componentized and virtual DOM to optimize performance. 2. Components use JSX to define, state and attributes to manage data. 3. Hooks simplify life cycle management. 4. Use ContextAPI to manage global status. 5. Common errors require debugging status updates and life cycles. 6. Optimization techniques include Memoization, code splitting and virtual scrolling.
The Future of React: Trends and Innovations in Web DevelopmentApr 19, 2025 am 12:22 AMReact's future will focus on the ultimate in component development, performance optimization and deep integration with other technology stacks. 1) React will further simplify the creation and management of components and promote the ultimate in component development. 2) Performance optimization will become the focus, especially in large applications. 3) React will be deeply integrated with technologies such as GraphQL and TypeScript to improve the development experience.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
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
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
SublimeText3 English version
Recommended: Win version, supports code prompts!
Atom editor mac version download
The most popular open source editor
