css - center using margin:auto for an img in a paragraph is not working -


i trying center image inside <p> used website, http://www.w3.org/style/examples/007/center.en.html, , found similar examples here nothing seems work.

my html code is

<div class="span4">      <h3 class="aglow" id="h3body">forms</h3>      <p>         <a class="btn btn-link "href="teacher_forms_list.html">            <img class="operationsbuttons" src="newforms.png" alt="forms">         </a>      </p> </div>

and css

   img.operationsbuttons {        display: block;        margin-left: auto;        margin-right: auto;        }

but reason image still on left (attaching picture of image , h3 centered on it)

not centered

thank help

as @tamil selvan answred, can use text-align: center; - demo

if using margin: auto; need define width img element display: block; img inline element default - demo


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