


CSS 3 Shape: "Inverse Circle" or "Cut Out Circle"
Creating shapes that resemble an "inverse circle" or a "cut out circle" in CSS is a common design challenge. Here's a breakdown of how to achieve this effect using CSS 3 techniques:
Update: CSS3 Radial Background Gradient Option
For browsers supporting CSS3 radial background gradients (e.g., Firefox, Chrome), a transparent "gap" can be created between the circle and its inverse cutout:
HTML:
<div> <p><strong>CSS:</strong></p> <pre class="brush:php;toolbar:false">.inversePair { border: 1px solid black; display: inline-block; position: relative; height: 100px; text-align: center; line-height: 100px; vertical-align: middle; } #a { width: 100px; border-radius: 50px; background: grey; z-index: 1; } #b { width: 200px; padding-left: 30px; margin-left: -30px; border-left: none; -webkit-border-top-right-radius: 20px; -webkit-border-bottom-right-radius: 20px; -moz-border-radius-topright: 20px; -moz-border-radius-bottomright: 20px; border-top-right-radius: 20px; border-bottom-right-radius: 20px; background-image: -moz-radial-gradient( -23px 50%, circle closest-corner, transparent 0, transparent 55px, black 56px, grey 57px ); }
Original Answer:
Using z-indexing and positioning, a clean "inverse circle" effect can be achieved:
HTML:
<div> <p><strong>CSS:</strong></p> <pre class="brush:php;toolbar:false">.inversePair { border: 1px solid black; background: grey; display: inline-block; position: relative; height: 100px; text-align: center; line-height: 100px; vertical-align: middle; } #a { width: 100px; border-radius: 50px; } #a:before { content: ' '; left: -6px; top: -6px; position: absolute; z-index: -1; width: 112px; height: 112px; border-radius: 56px; background-color: white; } #b { width: 200px; z-index: -2; padding-left: 50px; margin-left: -55px; overflow: hidden; -webkit-border-top-right-radius: 20px; -webkit-border-bottom-right-radius: 20px; -moz-border-radius-topright: 20px; -moz-border-radius-bottomright: 20px; border-top-right-radius: 20px; border-bottom-right-radius: 20px; } #b:before { content: ' '; left: -58px; top: -7px; position: absolute; width: 114px; height: 114px; border-radius: 57px; background-color: black; }
Both methods result in a visually appealing "inverse circle" effect without the need for images.
The above is the detailed content of How can I create an 'inverse circle' or 'cut out circle' effect using CSS3?. For more information, please follow other related articles on the PHP Chinese website!

In this post, Blackle Mori shows you a few of the hacks found while trying to push the limits of Cohost’s HTML support. Use these if you dare, lest you too get labelled a CSS criminal.

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


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

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

Dreamweaver Mac version
Visual web development tools

WebStorm Mac version
Useful JavaScript development tools

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

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),
