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<!DOCTYPE htpl> <htpl lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <title>Bootstrap 4 Width Classes Relative to the Viewport</title> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script> <style> .bs-example div{ padding: 15px; background: #dbdfe5; } .bs-example div:nth-child(2n){ background: #abb1b8; } </style> </head> <body> <div class="bs-example"> <div class="min-vw-100">Min-width 100vw</div> <div class="vw-100">Width 100vw</div> </div> </body>