css - Bootstrap center image -

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i trying center image on webpage. want appear above footer. no matter have tried far nothing works here html

 <div class="center-block">      <img alt="footer" title="footer"  class="image-footer" src="./img/demo.png"/>    </div>    <div class="navbar-fixed-bottom footer"> <ul class="foot-left">           <li><a href="#" class="menu_buttons" >home</a></li>            <li><a href="#" class="menu_buttons" >about</a></li>           <li><a href="#" class="menu_buttons" >support</a></li>          </ul>     <ul class="foot-right">         <li><a href="#" class="menu_buttons" >powered demo</a></li>     </ul>      </div>

and image-footer class :

 .image-footer   {     position:absolute;    top:680px;   }

no result far. have tried every possible combination know... please advice....

basics ?

<div class="text-center">     <img alt="footer" src="./img/demo.png"/> </div>

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