Home Web Front-end CSS Tutorial How to use the box-sizing property of CSS3 to solve the problem of div width and height being stretched by padding

How to use the box-sizing property of CSS3 to solve the problem of div width and height being stretched by padding

Mar 08, 2017 pm 02:25 PM

p Often the width and height of the entire layer exceed the predetermined range due to the setting of inner margins. The box-sizing property of CSS3 can easily solve this phenomenon. Let's explain in detail how to use the box-sizing property of CSS3. Solve the problem of p width and height being stretched by padding

Sometimes we set a fixed height or width for page elements (such as p). But if padding or borders are set for this p, then this p will be stretched. That is to say, its actual size becomes: the set width and height size + padding + border.
This may have an impact on our layout. If we don’t want the padding and borders to affect the fixed size we set, we can use the box-sizing css property to achieve this.

1, Introduction to box-sizing attribute
box-sizing allows us to define specific elements that match a certain area in a specific way.

box-sizing: content-box|border-box|inherit;
Copy after login
ValueDescription
content-box

This is the width and height behavior specified by CSS2.1.

The width and height are applied separately to the element's content box.

Draw the element's padding and borders outside the width and height.

border-box

The width and height set for the element determine the border box of the element .

就是说,为元素指定的任何内边距和边框都将在已设定的宽度和高度内进行绘制。

通过从已设定的宽度和高度分别减去边框和内边距才能得到内容的宽度和高度。

inherit规定应从父元素继承 box-sizing 属性的值。


2,设置元素内容尺寸(box-sizing:content-box)
content-box 是 box-sizing 属性的默认值。当元素的box-sizing是content-box的时候,我们给元素设置的宽度、高度实际上是设置这个元素内容的宽度、高度。而元素的内边距和边框会在宽度和高度之外绘制。

比如下面样例,我们设置宽高尺寸为:200px * 34px

<style>   
    .form-control {   
          width: 200px;   
          height: 34px;   
          padding: 6px 12px;   
          line-height: 1.42857143;   
          color: #555555;            
          border: 1px solid #cccccc;   
          border-radius: 4px;   
    }   
</style>   
<input class="form-control" type="text" placeholder="Email地址">
Copy after login


但加上内边距和边框后,输入框的实际尺寸变成:226px * 48px
How to use the box-sizing property of CSS3 to solve the problem of div width and height being stretched by padding

3,设置元素边框盒尺寸(box-sizing:border-box)
当元素的 box-sizing 是 border-box 的时候,我们给元素设置的宽度、高度实际上是设置这个元素边框盒的宽度、高度。也就是说内边距、边框都是在这个内部绘制,而不会把元素撑开。
还是同样的样例,设置为border-box后:

<style>   
    .form-control {   
          width: 200px;   
          height: 34px;   
          box-sizing: border-box;   
          padding: 6px 12px;   
          line-height: 1.42857143;   
          color: #555555;            
          border: 1px solid #cccccc;   
          border-radius: 4px;   
    }   
</style>   
<input class="form-control" type="text" placeholder="Email地址">
Copy after login


不管内边距和边框设置是多少,输入框尺寸固定是:200px * 34px
How to use the box-sizing property of CSS3 to solve the problem of div width and height being stretched by padding

The above is the detailed content of How to use the box-sizing property of CSS3 to solve the problem of div width and height being stretched by padding. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Stacked Cards with Sticky Positioning and a Dash of Sass Stacked Cards with Sticky Positioning and a Dash of Sass Apr 03, 2025 am 10:30 AM

The other day, I spotted this particularly lovely bit from Corey Ginnivan’s website where a collection of cards stack on top of one another as you scroll.

Google Fonts   Variable Fonts Google Fonts Variable Fonts Apr 09, 2025 am 10:42 AM

I see Google Fonts rolled out a new design (Tweet). Compared to the last big redesign, this feels much more iterative. I can barely tell the difference

How to Create an Animated Countdown Timer With HTML, CSS and JavaScript How to Create an Animated Countdown Timer With HTML, CSS and JavaScript Apr 11, 2025 am 11:29 AM

Have you ever needed a countdown timer on a project? For something like that, it might be natural to reach for a plugin, but it’s actually a lot more

Why are the purple slashed areas in the Flex layout mistakenly considered 'overflow space'? Why are the purple slashed areas in the Flex layout mistakenly considered 'overflow space'? Apr 05, 2025 pm 05:51 PM

Questions about purple slash areas in Flex layouts When using Flex layouts, you may encounter some confusing phenomena, such as in the developer tools (d...

How to select a child element with the first class name item through CSS? How to select a child element with the first class name item through CSS? Apr 05, 2025 pm 11:24 PM

When the number of elements is not fixed, how to select the first child element of the specified class name through CSS. When processing HTML structure, you often encounter different elements...

HTML Data Attributes Guide HTML Data Attributes Guide Apr 11, 2025 am 11:50 AM

Everything you ever wanted to know about data attributes in HTML, CSS, and JavaScript.

A Proof of Concept for Making Sass Faster A Proof of Concept for Making Sass Faster Apr 16, 2025 am 10:38 AM

At the start of a new project, Sass compilation happens in the blink of an eye. This feels great, especially when it’s paired with Browsersync, which reloads

See all articles