CSS学习笔记(一)-8.背景
一、背景色
默认元素都有背景色,只不过背景色是透明。
background-color: transparent;
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 <!-- 2 * @Author: invoker 3 * @Github: https://github.com/invoker2021 4 * @Date: 2021-07-12 17:45:48 5 * @LastEditors: invoker 6 * @LastEditTime: 2021-07-12 17:47:05 7 * @Description: 8 * @FilePath: \css\背景.html 9 --> 10 <!DOCTYPE html> 11 <html lang="en"> 12 13 <head> 14 <meta charset="UTF-8"> 15 <meta http-equiv="X-UA-Compatible" content="IE=edge"> 16 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 17 <title>背景-背景色</title> 18 <style> 19 .div1 { 20 background-color: transparent; 21 } 22 </style> 23 </head> 24 25 <body> 26 <div class='div1'></div> 27 <div></div> 28 </body> 29 30 </html>
二、背景图片
使用场景:1.logo,2.装饰图片 3.超大背景图片
有点:方便控制位置。
语法:background-image: url(bd.png)
默认展示:平铺
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 <!-- 2 * @Author: invoker 3 * @Github: https://github.com/invoker2021 4 * @Date: 2021-07-12 17:45:48 5 * @LastEditors: invoker 6 * @LastEditTime: 2021-07-12 18:07:47 7 * @Description: 8 * @FilePath: \css\背景.html 9 --> 10 <!DOCTYPE html> 11 <html lang="en"> 12 13 <head> 14 <meta charset="UTF-8"> 15 <meta http-equiv="X-UA-Compatible" content="IE=edge"> 16 <meta name="viewport" content="width=device-width, initial-scale=1.0"> 17 <title>背景-背景图片</title> 18 <style> 19 .div1 { 20 height: 1000px; 21 width: 1000px; 22 background-image: url(bd.png) 23 } 24 </style> 25 </head> 26 27 <body> 28 <div class='div1'></div> 29 <div></div> 30 </body> 31 32 </html>
1.不平铺
background-repeat: no-repeat;
2.平铺:
background-repeat: repeat;
3.沿X轴平铺:
background-repeat: repeat-x;
4.沿y轴平铺:
background-repeat:repeat-y;
5.背景颜色和背景图片都存在时,背景图片在背景颜色之上。
6.背景图片的位置:
6.1 方位名词
backgroud-postion:center top;
可选项:top center right left bottom;
6.2 精确定位:
background-position: 20px 30px;
6.3 混合单位:(第一个必须是x轴,第二个必须是Y轴)
background-position: left 30px;
7.背景图片固定或则滚动:
background-attachment: scroll / fixed;
8.背景简写:
background:颜色,图片地址,平铺,图像滚动,位置
background: orange url(bd.png) no-repeat fixed center top;
9.背景色半透明:
background: rgba(0,0,0,0.3)
或:
background: rgba(0,0,0,.3)
本文来自博客园,作者:kaer_invoker,转载请注明原文链接:https://www.cnblogs.com/invoker2021/p/15003345.html