div { height: 100vh; }

css window height

<!DOCTYPE html> <html> <head> <title>100% height</title> <style> html, body { height: 100%; margin: 0; } .container { height: 100%; background: #000; /* to see the effect */ } </style> </head> <body> <div class="container"></div> </body> </html>

css 100% height

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