css背景 1.1 背景颜色 background-color 1.
cssbackground属性
老师像backgroundsize这样的css属性通过对象引入style里面在代码里要
711 css属性-背景:background-image,repeat,size,position
图片显示 无特殊要求时,按原图宽高比显示 background-size: cover
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