要使一组按钮跨越屏幕的整个宽度，请使用.btn-group-justified。
您可以尝试运行以下代码以实现 .btn-group-justified类-
<!DOCTYPE html> <html> <head> <title>Bootstrap Example</title> <link rel = "stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css"> <script src = "https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script> <script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> </head> <body> <p>The following are the car brands:</p> <div class = "btn-group"> <button type = "button" class="btn btn-default">BMW</button> <button type = "button" class="btn btn-default">Audi</button> <button type = "button" class="btn btn-default">Jeep</button> <button type = "button" class="btn btn-default">Datsun</button> <button type = "button" class="btn btn-default">Toyota</button> </div> <p>The following are FMCG:</p> <div class = "btn-group-justified"> <button type = "button" class="btn btn-default">ITC Limited</button> <button type = "button" class="btn btn-default">Colgate-Palmolive</button> <button type = "button" class="btn btn-default">Nestle</button> <button type = "button" class="btn btn-default">Britannia Industries Limited</button> </div> </body> </html>