Css样式支持两种方式，内联和外部文件方式

官方建议一旦超过10行，就建议采用外部文件方式

supported style selector and properties

type selector,class selector,id selector,attribute selector,hierarchial selector

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add image to app

chanllenges on different mobile devices

for different DPI

android

iOS

you can continue set the image size. Image{width:80;height:80},

except css styling you can use the theme soultion.