CSS :root Selector - Snippet Editor

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<!DOCTYPE html> <html> <head> <title>CSS :root Selector</title> <style type="text/css"> :root { background: #ff0000; } div { width: 400px; height: 130px; border: 1px solid yellow; } </style> </head> <body> <h1>This is a heading</h1> </body> </html>