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https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_vertical_line
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .vl { border-left: 6px solid green; height: 500px; } </style> </head> <body> <h2>Vertical Line</h2> <div class="vl"></div> </body> </html> |