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How to set the size of background image in css

青灯夜游

Apr 21, 2021 pm 03:29 PM

background-sizecssBackground picture

In CSS, you can use the background-size attribute to set the size of the background image. This attribute can specify the size of the background image. The syntax format is "background-size: numerical value with length unit | percentage value | cover | contain ;".

How to set the size of background image in css

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

In CSS, you can use the background-size attribute to set the size of the background image; it can be displayed by length value or percentage, and you can also scale the image through cover and contain.

background-size:auto;/* 默认值，不改变背景图片的高度和宽度 */
background-size:100px 50px;/* 第一个值为宽，第二个值为高，当设置一个值时，将其作为图片宽度来等比缩放 */
background-size:10%;/* 0％~100％之间的任何值，将背景图片宽高按百分比显示，当设置一个值的时候同也将其作为图片宽度来等比缩放 */
background-size:cover;/* 将背景图片等比缩放填满整个容器 */
background-size:contain;/* 将背景图片等比缩放至某一边紧贴容器边缘 */

Attribute value:

Value	Description
length	Set the height and width of the background image. The first value sets the width, and the second value sets the height. If only one value is set, the second value will be set to "auto".
percentage	Set the width and height of the background image as a percentage of the parent element. The first value sets the width, and the second value sets the height. If only one value is set, the second value will be set to "auto".
cover	Expand the background image large enough so that the background image completely covers the background area. Some parts of the background image may not be displayed in the background positioning area.
contain	Expands the image image to its maximum size so that its width and height fully fit within the content area.

Code example:

<!DOCTYPE html>
<html>

	<head>
		<meta charset="utf-8">
		<style>
			body {
				background: url(img/5.jpg);
				background-size: 100px 100px;
				-moz-background-size: 100px 100px;
				/* 老版本的 Firefox */
				background-repeat: no-repeat;
				padding-top: 80px;
			}
		</style>
	</head>

	<body>
		<p>上面是缩小的背景图片。</p>

		<p>原始图片：<br />
			<img src="/static/imghwm/default1.png"  data-src="img/5.jpg"  class="lazy"   alt="Flowers"></p>

	</body>

</html>

Effect picture:

How to set the size of background image in css

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