Bootstrap Grid System
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row"> <div class="col-md-6">Stacks on phones, half width on tablets+</div> <div class="col-md-6">Stacks on phones, half width on tablets+</div> </div> </div> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script> </body> </html>