Quote Originally Posted by dw08gm View Post
You may need to prescribe a width for the element concerned before applying margin:auto; in css.
I centred my logo for desktop display with the following:

In file includes/templates/YOUR_TEMPLATE/css/stylesheet.css line 128 after the #logo element
HTML Code:
.centred {text-align:center;}
In file includes/templates/YOUR_TEMPLATE/common/tpl_header.php line 167 change
HTML Code:
<div id="logo">
To be
HTML Code:
<div id="logo" class="centred">