css background 复合写法(组合写法)

复合模版

background: 颜色(color或image) 位置(position) 是否填充(repeat);
background-size: cover;

复合写法例子

例子1

background: url('./images/1.jpg') 100% 100% no-repeat;
background-size: cover;

例子2

background: url('./images/1.jpg') 30px 30px no-repeat;
background-size: 40px 40px;