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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> * { box-sizing: border-box; } body { margin: 0; overflow-x: hidden; } .parent { max-width: 400px; margin: 0 auto; padding: 1rem; position: relative; background-color: #c0c2c2; } .child { width: 100vw; position: relative; left: calc(-50vw + 50%); height: 100px; background-color: #535fcf; } </style> </head> <body> <div class="parent"> <div class="child"></div> </div> </body> </html>