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<html><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script> <style> body { position: relative; } .affix { top:0; width: 100%; z-index: 9999 !important; } .navbar { margin-bottom: 0px; } .affix ~ .container-fluid { position: relative; top: 50px; } #section1 {padding-top:50px;height:500px;color: #fff; background-color: #1E88E5;} #section2 {padding-top:50px;height:500px;color: #fff; background-color: #673ab7;}