How to implement a dialog box in css: first create an HTML sample file; then position the parent element relatively; then use the CSS pseudo-class before or after to write a triangle; and finally implement the dialog box by setting the css style. .
The operating environment of this article: Windows7 system, HTML5&&CSS3 version, Dell G3 computer.
Pure css writing with a small triangle dialog box
In actual styles, it is often encountered to write a style similar to a dialog box, and this style often has a The small triangle is as follows:
Example picture
So how to write it in css? It’s actually very simple. First make the parent element relative Position, and then use the CSS pseudo-class before or after. You can write a triangle. If you want a triangle with a border, you can overlap two. The code is as follows:
<p> 纯css写带小三角对话框 </p>
.box2{ float:left; position:relative; width:200px; height:100px; border:1px solid #00f; margin:50px; box-sizing:border-box; font-size:14px; padding:10px; box-shadow:0 0 2px rgba(0,0,0,.5) } .box2:before, .box2:after{ position:absolute; content:''; border:10px solid; } .box2:before{ right: -20px; top:20px; border-color: transparent transparent transparent #00f; } .box2:after{ border-color: transparent transparent transparent #fff; right: -18px; top: 20px; }
Recommended learning: css video tutorial
The above is the detailed content of How to implement dialog box in css. For more information, please follow other related articles on the PHP Chinese website!

Custom cursors with CSS are great, but we can take things to the next level with JavaScript. Using JavaScript, we can transition between cursor states, place dynamic text within the cursor, apply complex animations, and apply filters.

Interactive CSS animations with elements ricocheting off each other seem more plausible in 2025. While it’s unnecessary to implement Pong in CSS, the increasing flexibility and power of CSS reinforce Lee's suspicion that one day it will be a

Tips and tricks on utilizing the CSS backdrop-filter property to style user interfaces. You’ll learn how to layer backdrop filters among multiple elements, and integrate them with other CSS graphical effects to create elaborate designs.

Well, it turns out that SVG's built-in animation features were never deprecated as planned. Sure, CSS and JavaScript are more than capable of carrying the load, but it's good to know that SMIL is not dead in the water as previously

Yay, let's jump for text-wrap: pretty landing in Safari Technology Preview! But beware that it's different from how it works in Chromium browsers.

This CSS-Tricks update highlights significant progress in the Almanac, recent podcast appearances, a new CSS counters guide, and the addition of several new authors contributing valuable content.

Most of the time, people showcase Tailwind's @apply feature with one of Tailwind's single-property utilities (which changes a single CSS declaration). When showcased this way, @apply doesn't sound promising at all. So obvio

Deploying like an idiot comes down to a mismatch between the tools you use to deploy and the reward in complexity reduced versus complexity added.


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

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Notepad++7.3.1
Easy-to-use and free code editor

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),
