helper classes in bootstrap

Close icon

To dismiss content like as modals and notifications, use the generic close icon. Use the class close to get the close icon.


Carets are used to show the functioning and orientation of dropdown menus. Use the class caret with a span> element to gain this capability.

<style media="screen"> h1{ color:blue; font-weight: bold; } </style> <body class="container"> <h1>This is knowledge 2life!</h1> <!--Alert--> <div class="alert alert-success alert-dismissible fade show w-50" role="alert"> <strong>knowledge!</strong> <!--Close Icon--> <button type="button" class="btn close" data-dismiss="alert" aria-label="Close"> <span aria-hidden="true">×</span> </button> </div>


close icon

Quick Floats

With the classes pull-left and pull-right, you can float an element to the left or right, accordingly.

Instead of using.navbar-left or.navbar-right, use.navbar-left or.navbar-right to align components in navbars with utility classes. For more information, see the navbar chapter.

<div class="container"> <h1 >Knowledge 2life</h1> <b>Bootstrap Floating utility class</b> <br> <div class="pull-left"> This div floats to the left. </div> <br> <div class="pull-right"> This div floats to the right. </div> <br> </div>


quick floats

Center Content Blocks

To centre an element, use the class center-block.

<div class="bs-example"> <div class="container"> <div class="row"> <div class="col-lg-12 bg-light text-center"> <h1>knowledge 2life</h1> <h2> Centered Content in Bootstrap. </h2> <img src=dol_img.jpeg alt="know" height="200px"> </div> </div> </div> </div>


center contents


To clear the float of any element, use the.clearfix class.

<div class="container"> <div class="bg-info clearfix"> <button type="button" class="btn btn-secondary left"> floated left-btn </button> <button type="button" class="btn btn-secondary right"> floated right-btn </button> </div>



Content Displaying and Hiding

The and.hidden can be used to cause an element to be visible or hidden (even for screen readers).

<h1 > knowledge 2life</h1> <p id="GFG_UP"></p> <div id="div"> This is Div box. </div> <br> <button onClick="GFG_Fun()"> click here </button> <br> <p id="GFG_DOWN" style="color: blue;"></p> <script> $('#GFG_UP').text( "Click on button "); function show(divId) { $("#" + divId).show(); } function GFG_Fun() { show('div'); $('#GFG_DOWN').text("DIV Box is visible."); } </script>


Content Displaying and Hiding

Content for Screen Readers

With the, you can hide an element from all devices except screen readers.

<h1 class="sr-only">knowledge 2life</h1>


Content for Screen Readers