Css center alignment setting method: 1. Horizontal centering [text-align:center]; 2. Horizontal centering [margin: 0 auto]; 3. Vertical centering [line-height]; 4. Use tables , horizontal and vertical centering; 5. Flexible layout, horizontal and vertical centering.
The operating environment of this tutorial: windows7 system, css3 version, DELL G3 computer.
How to set css center alignment:
1. text-align:center - horizontal centering
Only for text, pictures, buttons, etc. Inline elements are valid (display is set to inline or inline-block, etc.) for horizontal centering
2, margin: 0 auto; —— Horizontal centering
is only horizontally centered, and is invalid for floating element positioning
.father{
width:500px;
height:200px;
background-color::#f98769;
overflow:hidden;//不可缺少否則margin-top不生效
}
.son{
width: 100px;
height: 100px;
margin:50px auto ;
background-color: #ff0000;
}3. line-height - vertical centering
line-height=height, only valid for one line of text
4. Use table - horizontal and vertical centering
The align='center' and valign='middle' attributes of td/th can be centered horizontally and vertically
5. Flexible layout - horizontal and vertical centering
.father{
display:flex;
justity-content:center;
align-items:center;
}
.father{
display:flex;
flex-direction:column;//改變主軸為cross axis
justity-content:center;
}6. Use display: table-cell - horizontal and vertical centering
For those elements that are not tables, we can use display:table-cell to simulate it into a table cell
.father{
height:300px;
background:#ccc;
display:table-cell; /*IE8以上及Chrome、Firefox*/
vertical-align:middle; /*IE8以上及Chrome、Firefox*/
text-align:center;
}
.son{
display:inline-block;//或是inline
}7. Strange skills - the child must be the same as the father (the width and height of the child element are known) - horizontal and vertical centering
.father{
position:relative;
}
.son{//m、n為子盒子寬、高的一半
position:absolute;
left:50%;
top:50%;
margin-left:-mpx;
margin-top:-npx;8. The width and height of the unknown child element - horizontal and vertical centering
.father {
position:relative;
}
.son {
position:absolute;
top:50%;
left:50%:
transform:translate(-50%,-50%) /*單獨設置transform:translateY(-50%);*/
}9. Pseudo element method - vertical centering
.father{
position: relative;
}
.father::before{
content: " ";
display: inline-block;
height: 100%;
width: 1%;
vertical-align: middle;
}
.son{
display: inline-block;
vertical-align: middle;
}Recommended related tutorials: CSS video tutorial
The above is the detailed content of How to set css center alignment. 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
What is 'render-blocking CSS'?
Jun 24, 2025 am 12:42 AM
CSS blocks page rendering because browsers view inline and external CSS as key resources by default, especially with imported stylesheets, header large amounts of inline CSS, and unoptimized media query styles. 1. Extract critical CSS and embed it into HTML; 2. Delay loading non-critical CSS through JavaScript; 3. Use media attributes to optimize loading such as print styles; 4. Compress and merge CSS to reduce requests. It is recommended to use tools to extract key CSS, combine rel="preload" asynchronous loading, and use media delayed loading reasonably to avoid excessive splitting and complex script control.
How can CSS be used to implement dark mode theming on a website?
Jun 19, 2025 am 12:51 AM
ToimplementdarkmodeinCSSeffectively,useCSSvariablesforthemecolors,detectsystempreferenceswithprefers-color-scheme,addamanualtogglebutton,andhandleimagesandbackgroundsthoughtfully.1.DefineCSSvariablesforlightanddarkthemestomanagecolorsefficiently.2.Us
Can you explain the difference between em, rem, px, and viewport units (vh, vw)?
Jun 19, 2025 am 12:51 AM
The topic differencebetweenem, Rem, PX, andViewportunits (VH, VW) LiesintheirreFerencepoint: PXISFixedandbasedonpixelvalues, emissrelative EtothefontsizeFheelementoritsparent, Remisrelelatotherootfontsize, AndVH/VwarebaseDontheviewporttimensions.1.PXoffersprecis
External vs. Internal CSS: What's the Best Approach?
Jun 20, 2025 am 12:45 AM
ThebestapproachforCSSdependsontheproject'sspecificneeds.Forlargerprojects,externalCSSisbetterduetomaintainabilityandreusability;forsmallerprojectsorsingle-pageapplications,internalCSSmightbemoresuitable.It'scrucialtobalanceprojectsize,performanceneed
Does my CSS must be on lower case?
Jun 19, 2025 am 12:29 AM
No,CSSdoesnothavetobeinlowercase.However,usinglowercaseisrecommendedfor:1)Consistencyandreadability,2)Avoidingerrorsinrelatedtechnologies,3)Potentialperformancebenefits,and4)Improvedcollaborationwithinteams.
What are the key differences between inline, block, inline-block, and flex display values?
Jun 20, 2025 am 01:01 AM
Choosing the correct display value in CSS is crucial because it controls the behavior of elements in the layout. 1.inline: Make elements flow like text, without occupying a single line, and cannot directly set width and height, suitable for elements in text, such as; 2.block: Make elements exclusively occupy one line and occupy all width, can set width and height and inner and outer margins, suitable for structured elements, such as; 3.inline-block: has both block characteristics and inline layout, can set size but still display in the same line, suitable for horizontal layouts that require consistent spacing; 4.flex: Modern layout mode, suitable for containers, easy to achieve alignment and distribution through justify-content, align-items and other attributes, yes
What is Autoprefixer and how does it work?
Jul 02, 2025 am 01:15 AM
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.
How can you animate an SVG with CSS?
Jun 30, 2025 am 02:06 AM
AnimatingSVGwithCSSispossibleusingkeyframesforbasicanimationsandtransitionsforinteractiveeffects.1.Use@keyframestodefineanimationstagesforpropertieslikescale,opacity,andcolor.2.ApplytheanimationtoSVGelementssuchas,,orviaCSSclasses.3.Forhoverorstate-b
