


CSS overflow:auto is invalid. Is the negative value of the parent element z-index the culprit?
Apr 05, 2025 am 07:12 AM CSS scroll bar failure troubleshooting: overflow: auto
failure cause and solution
In CSS, when creating scrollbars using overflow: auto
attribute, you sometimes encounter the problem that the scrollbars are displayed but cannot scroll. This article will analyze a case and provide solutions.
Problem description: A container with overflow: auto
set, the content height exceeds the container, the scroll bar appears, but it cannot scroll. z-index
attribute value of the parent element of the container is negative.
Problem code snippet:
height: 250px; box-sizing: border-box; border-bottom: 1px solid #000; background-color: #eee; overflow: auto; scroll-snap-type: y mandatory; position: relative; z-index: 99;
The container has a height of 250px, and overflow: auto
is set, but the scrolling is invalid because z-index
of the parent element is a negative value.
Cause analysis: z-index
controls the stacking order of elements. A negative z-index
value indicates that the element is located below other elements. A negative z-index
of the parent element may obscure the child element, making it unable to respond to user interactions, even if the child element z-index
is a positive value.
Solution: Check the parent element's z-index
, set it to a non-negative value, or adjust the parent and child elements' z-index
values ??to ensure that the child elements are visible and interactive.
Sample code that can scroll normally:
<div class="box"> <div>123</div> <div>123</div> <!-- ... more divs ... --> </div>
.box { height: 150px; box-sizing: border-box; border-bottom: 1px solid #000; background-color: #eee; overflow: auto; scroll-snap-type: y mandatory; position: relative; z-index: 99; }
In this example, the container can be scrolled normally, and the key is to ensure that z-index
of the parent element does not affect the display and interaction of the child element. Ensuring that the parent element's z-index value does not conflict with the child element is the key to solving the problem.
The above is the detailed content of CSS overflow:auto is invalid. Is the negative value of the parent element z-index the culprit?. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undress AI Tool
Undress images for free

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

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

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

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Autoprefixer is a tool that automatically adds vendor prefixes to CSS attributes based on the target browser scope. 1. It solves the problem of manually maintaining prefixes with errors; 2. Work through the PostCSS plug-in form, parse CSS, analyze attributes that need to be prefixed, and generate code according to configuration; 3. The usage steps include installing plug-ins, setting browserslist, and enabling them in the build process; 4. Notes include not manually adding prefixes, keeping configuration updates, prefixes not all attributes, and it is recommended to use them with the preprocessor.

AnimatingSVGwithCSSispossibleusingkeyframesforbasicanimationsandtransitionsforinteractiveeffects.1.Use@keyframestodefineanimationstagesforpropertieslikescale,opacity,andcolor.2.ApplytheanimationtoSVGelementssuchas,,orviaCSSclasses.3.Forhoverorstate-b

Theconic-gradient()functioninCSScreatescirculargradientsthatrotatecolorstopsaroundacentralpoint.1.Itisidealforpiecharts,progressindicators,colorwheels,anddecorativebackgrounds.2.Itworksbydefiningcolorstopsatspecificangles,optionallystartingfromadefin

Mobile-firstCSSdesignrequiressettingtheviewportmetatag,usingrelativeunits,stylingfromsmallscreensup,optimizingtypographyandtouchtargets.First,addtocontrolscaling.Second,use%,em,orreminsteadofpixelsforflexiblelayouts.Third,writebasestylesformobile,the

There are three ways to create a CSS loading rotator: 1. Use the basic rotator of borders to achieve simple animation through HTML and CSS; 2. Use a custom rotator of multiple points to achieve the jump effect through different delay times; 3. Add a rotator in the button and switch classes through JavaScript to display the loading status. Each approach emphasizes the importance of design details such as color, size, accessibility and performance optimization to enhance the user experience.

The top ten virtual currency trading platforms in Europe in 2025 include Binance, OKX, Coinbase, etc., and are selected based on compliance, security, expenses, asset types and user experience. 1. Binance: The world has the largest transaction volume, low fees, and has obtained a license in multiple countries; 2. OKX: Comprehensive products, strong technology, registered in France; 3. Coinbase: Compliance and safety, suitable for beginners, licensed in many countries; 4. Gate.io: Has a long history, high security, registered in many European countries; 5. Bitstamp: Founded early, has strong compliance, regulated by Luxembourg; 6. eToro: Supports social transactions, diversified investment, regulated by CySEC; 7. Bitpanda: World

FeaturedetectioninCSSusing@supportschecksifabrowsersupportsaspecificfeaturebeforeapplyingrelatedstyles.1.ItusesconditionalCSSblocksbasedonproperty-valuepairs,suchas@supports(display:grid).2.Thismethodensuresfuturecompatibilityandavoidsrelianceonunrel

HTML5, CSS and JavaScript should be efficiently combined with semantic tags, reasonable loading order and decoupling design. 1. Use HTML5 semantic tags, such as improving structural clarity and maintainability, which is conducive to SEO and barrier-free access; 2. CSS should be placed in, use external files and split by module to avoid inline styles and delayed loading problems; 3. JavaScript is recommended to be introduced in front, and use defer or async to load asynchronously to avoid blocking rendering; 4. Reduce strong dependence between the three, drive behavior through data-* attributes and class name control status, and improve collaboration efficiency through unified naming specifications. These methods can effectively optimize page performance and collaborate with teams.
