<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> #container { width: 200px; height: 200px; } .card{ width: 100%; height:100%; margin: 0 auto; overflow: hidden; } .card_a{ background-color: red; } .card_b{ background-color: blue; display: none; } </style> </head> <body> <div id="container"> <div class="card card_a">A</div> <div class="card card_b">B</div> </div> <script src="main.js"></script> </body> </html>
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