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## 简单案例 ``` <style> #box { width: 200px; height: 200px; background-color: black; } @media screen and (max-width: 768px) { #box { background-color: pink; } } @media screen and (min-width: 768px) and (max-width: 1200px) { #box { background-color: skyblue; } } @media screen and (min-width: 1200px) { #box { background-color: yellow; } } </style> </head> <body> <div id="box"> </div> </body> ```