CSS Mozilla center alignment -

i have page, after rendering should return cloud tags. , works fine. alignment of tags not in center in mozilla. tags in center in chrome , i7, in mozilla on left side.

my .html:

{% extends "base.html" %} {% block title %} tag cloud {% endblock %} {% block head %} tag cloud {% endblock %} {% block content %}     <div id="tag-cloud">         {% tag in tags %}             <a href="/tag/{{tag.name|urlencode}}/" class="tag-cloud-{{tag.weight}}">{{ tag.name|escape }}</a>         {% endfor %}     </div> {% endblock %} 

my .css:

#nav {     float:right; }  input {     display:block; }  ul.tags, ul.tags li {     list-style: none;     margin: 0;     padding: 0;     color: blue;     display: inline; }  #tag-cloud {     text-align:center; }  #tag-cloud {     margin: 0 0.2em; }  .tag-cloud-0 { font-sie:100; } .tag-cloud-1 { font-sie:120; } .tag-cloud-2 { font-sie:140; } .tag-cloud-3 { font-sie:160; } .tag-cloud-4 { font-sie:180; } .tag-cloud-5 { font-sie:200; }