Created a fixed heder, in theory it should collapse on narrow screens, instead nothing changes, 2 photos should be the site itself - https://i.stack.imgur.com/FVhyJ.jpg should - https: //i.stack .imgur.com / AjKNZ.jpg out - https://i.stack.imgur.com/X0wza.png
<div class="navbar navbar-inverse navbar-fixed-top"> <div class="container"> <div class="navbar-header"> <button class="navbar-toggle" data-toggle = "collapse" data-target = ".navbar-collapse"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand" href="#" style="color: grey; font-size: 12pt;"> <span style="font-family: Comic Sans MS; font-size: 12pt;">Shumik_UA</span></a> </div> <div class="navbar-collapse collapse"> <? if ($_SESSION["is_logged"] == false) { require("includes/login.html"); } if ($_SESSION["is_logged"] == true) { require("includes/islogged.html"); } ?> </div> </div> </div> 