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<!DOCTYPE html> <html> <head> <style> :root { --main-bg-color: coral; --main-txt-color: blue; --main-padding: 15px; } #div1 { background-color: var(--main-bg-color); color: var(--main-txt-color); padding: var(--main-padding); } #div2 { background-color: var(--main-bg-color); color: var(--main-txt-color); padding: var(--main-padding); } #div3 { background-color: var(--main-bg-color); color: var(--main-txt-color); padding: var(--main-padding); } </style> </head> <body> <h1>var() 函数</h1> <div id="div1">Shanghai is one of the four direct-administered municipalities of the People's Republic of China. Welcome to Shanghai!</div> <br> <div id="div2">Shanghai is one of the four direct-administered municipalities of the People's Republic of China. Welcome to Shanghai!</div> <br> <div id="div3">Shanghai is one of the four direct-administered municipalities of the People's Republic of China. Welcome to Shanghai!</div> </body> </html>