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<!DOCTYPE html> <html> <head> <style> :root { --main-bg-color: coral; } #div1 { background-color: var(--main-bg-color); padding: 5px; } #div2 { background-color: var(--main-bg-color); padding: 5px; } #div3 { background-color: var(--main-bg-color); padding: 5px; } </style> </head> <body> <h1>var() 函数</h1> <div id="div1">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.</div> <br> <div id="div2">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.</div> <br> <div id="div3">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.</div> </body> </html>