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                ## device device指設備的寬度.所以該媒體功能只在移動端起作用.無法在PC端使用(因為電腦屏幕的尺寸沒有發生變化). 下面的例子在移動端會發生顏色的變化,而在PC端不會發生變化. ``` body { background-color: red; } @media screen and (min-device-width: 768px) { body { background-color: green; } } @media screen and (min-device-width: 992px) { body { background-color: blue; } } @media screen and (min-device-width: 1200px) { body { background-color: pink; } } ```
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