https://example.com/style.css Xbody { text-align:center; } iframe { display:block; margin:10px auto; width:540px; height:500px; }https://example.com/script.js X$('button').click(function() { $('iframe').attr('src', $('input').val()); }); $('select').change(function() { $('iframe').css('width', $(this).val() + 'px'); }); 540 600 1024 1350 Cek Responsibilitas