background-size

https://www.runoob.com/cssref/css3-pr-background-size.html

background-size属性指定背景图片大小。

• 例子

div {
    background: url(../static/images/icon_introduce_bg.png) 100% no-repeat;
    
    background-size:100% 100%;
    -moz-background-size:100% 100%
}