CSS Top Percent Property Not Functioning
When attempting to implement a responsive CSS layout, it is observed that the "top: 50%" property is not functioning as intended, while the "left: 50%" property is working. This issue arises because the "top" property requires a reference parent element with a defined height.
<div>
To resolve this issue, there are two potential solutions:
-
Define a Dimension for the Parent Container:
Provide a specific height and width for the parent container, ensuring it has a defined area for the child element to be positioned.
<div>
-
Stretch the Parent Container:
Alternatively, the parent container can be stretched using the "top," "bottom," "left," and "right" properties. This provides the child element with a reference area for its "top" positioning.
<div>
The above is the detailed content of Why Isn't My CSS 'top: 50%' Property Working?. 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.

TocreatestickyheadersandfooterswithCSS,useposition:stickyforheaderswithtopvalueandz-index,ensuringparentcontainersdon’trestrictit.1.Forstickyheaders:setposition:sticky,top:0,z-index,andbackgroundcolor.2.Forstickyfooters,betteruseposition:fixedwithbot

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

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.

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

To make the entire grid layout centered in the viewport, it can be achieved by the following methods: 1. Use margin:0auto to achieve horizontal centering, and the container needs to be set to set the fixed width, which is suitable for fixed layout; 2. Use Flexbox to set the justify-content and align-items properties in the outer container, and combine min-height:100vh to achieve vertical and horizontal centering, which is suitable for full-screen display scenarios; 3. Use CSSGrid's place-items property to quickly center on the parent container, which is simple and has good support from modern browsers, and at the same time, it is necessary to ensure that the parent container has sufficient height. Each method has applicable scenarios and restrictions, just choose the appropriate solution according to actual needs.

To create an intrinsic responsive grid layout, the core method is to use CSSGrid's repeat(auto-fit,minmax()) mode; 1. Set grid-template-columns:repeat(auto-fit,minmax(200px,1fr)) to let the browser automatically adjust the number of columns and limit the minimum and maximum widths of each column; 2. Use gap to control grid spacing; 3. The container should be set to relative units such as width:100%, and use box-sizing:border-box to avoid width calculation errors and center them with margin:auto; 4. Optionally set the row height and content alignment to improve visual consistency, such as row

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