Bonjour,
Alors voila, mon problème est simpe : je n'ai pas la même taille de police sur IE et sur firefox quand j'ouvre mon blog. Pour aller vérifier de vous même : www.lille-lome.com
Je vous donne le css, ca peut aider.
C'est surement un problme simple mais je suis bloqué !
Merci !

##########################################/* ***** BEGIN LICENSE BLOCK *****
* This file is part of DotClear.
* Copyright (c) 2004 Samuel Latchman and contributors. All rights
* reserved.
*
* DotClear is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* DotClear is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DotClear; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ***** END LICENSE BLOCK *****
*
* Contributor(s):
* Olivier Meunier
* Philippe
* Marc SARTON
*/

body{
background-image: url(images/diagonals.gif) repeat;
padding: 0em 0em 0em 0em;
background-color: #405060;

}

html>body{
font-size:small;
margin:0em;
padding:0em;
}
p {
margin : 1em 0;
}
img {
padding:0.2em;
border : 1px solid #CCCCCC;
}

form {
display : block;
margin : 0;
padding : 0; }
h2,h3 {
font-family:Georgia, "Times New Roman", Times, serif
}


p.present{
font-family: times, serif ;
font-size: 10pt ;
color: green ;
font-style: italic ;
text-align: justify;
}

#present{
text-weight: bold;
}

hpatience {

text-align: justify;
color: #208060;
text-align: justify;
font-size: 10pt ;
}

.hliens{
color: #a08060;
text-weight: bold;
}

h1 {
font-size : 3em;
margin-left: 0em;
margin-top: 0.5em;
padding:0em 0em 0em 0.2em;
font-family: Georgia, "Times New Roman", Times, serif;
color: #204060;
font-style: italic;
text-align: right;
}
h2 {
font-size : 1.3em;
margin : 0.83em 0;
color: #666666;
}
h3 {
font-size : 1.17em;
margin : 1em 0;
color: #a08060;
}
h4 {
font-size : 1em;
margin : 1.33em 0;
}
h5 {
font-size : 0.83em;
margin : 1.67em 0;
}
h6 {
font-size : 0.67em;
margin : 2.33em 0;
}
h1 a{
color:#000000;
}

code,pre { font-family : "Courier New",monospace; font-size : 1em; overflow:auto; border:1px dotted #666;}

q { font-style : italic; }

a {color : #666666;}
a:hover, a:focus, a:active {color: #1B5EA8;}

a[hreflang]:after {content: "\0000a0(" attr(hreflang) ")";color : #666;background : transparent;}

h1 a, h1 a:hover, h1 a:focus, h1 a:active {text-decoration : none;color:#FEE7B9;}

/* Le bandeau et les onglets
-------------------------------------------------------- */
#header{
margin:0em;
padding:0em;
font-size:1em;
font-weight:bold;
line-height:normal;
background: transparent;
/*border: 1px solid #666666;*/
}

#bandeau{
margin:0em;
padding:0em;
height:100px;
background: #405060 url(images/banner.jpg) no-repeat center;
border: 1px solid #405060;
}

#bandeau p {
color:#FFFFFF;
margin:0.5em 0.5em;
padding: 0;
}
#bandeau img {border:none;}

#header ul{
margin:0;
padding:10px 10px 0;
list-style:none;
}
#header li{
float:left;
background: url("images/left.gif") no-repeat left top;
margin:0;
padding:0 0 0 9px;
}
#header a{
float:left;
display:block;
background: url("images/right.gif") no-repeat right top;
padding:5px 15px 4px 6px;
text-decoration:none;
font-weight:bold;
color:#000000;
}

/* Commented Backslash Hack
hides rule from IE5-Mac \*/
#header a {float:none;}
/* End IE5-Mac hack */
#header a:hover{
color:#0033CC;
}
#header #current{
background-image: url("images/left_on.gif");
}
#header #current a{
background-image: url("images/right_on.gif");
color:#333;
padding-bottom:5px;
}
#header p {
float:right;
color:#FFFFCC;
display:block;
font-size:0.85em;
margin:0.5em 0.5em 0em 0em;
padding:0.5em 0em 0em 0em;
text-align:right;
}
/* Le prelude
-------------------------------------------------------- */
#prelude{
background: transparent;
color: #DFDFDF;
}

#prelude a{
color: #DFDFDF;
background: transparent;
}

#prelude a:hover{
color: #FEE7B9;
background: transparent;
}


/* Layout
-------------------------------------------------------- */
#conteneur{
width:80%;
margin:20px auto 20px auto;
padding:0.2em;
text-align:left;
background-color: #405060;

}
#contenu{
clear:both;
margin:0em auto 0em auto;
padding:1em;
background-color: #FFFFFF;
}

#page {
margin : 0 auto;
padding : 0;
min-height:400px;
}
#main {
float : left;
width:70%;
margin-right : 1em;
}

#main h3 {
color : #333;
margin-top : 1em;
}

#content {
padding : 1px 1em 1em 19px;
border-right: 1px dotted #0066CC;
}

#content p{
text-align:justify;
}

#content table{
text-align:justify;
font-size:1em;
}

/* Sidebar
-------------------------------------------------------- */
#sidebar {
float:right;
width : 13em;
margin : 0em 0.5em 0em 0em;;

}
#sidebar h2 {
color : #666666;
font-size : 1em;
border-top : 1px dotted #0066CC;
padding : 0.5em 0 0 0;
margin : 1.3em 0 0.3em 0;
}

#sidebar h3{
font-size: 1em;
margin: 0;
}
#sidebar h4 {
font-weight : normal;
color : #666666;
font-size : 1em;
padding : 0 0 0 0;
margin : 1.3em 0 0.5em 0;

}
#sidebar ul {
padding-left : 1.5em;
margin : 0 0 0 0;
}

#sidebar li {
list-style : none;
margin: 0.2em 0;
color : #e2d6ad;
}

#sidebar a:hover {
color:#0000FF;
background : transparent;
}

#sidebar a {
text-decoration : none;
color:#666666;
}

.sidebarleft{text-align : left ;}


/* Post
-------------------------------------------------------- */
.day-date {
font-size : 0.8em;
font-weight : bold;
margin-top : 2em;
text-align : right;
border-top : 1px dotted #0066CC;
color : #666;
background : transparent;
}

.post {
margin-bottom : 2.5em;
}
.post-title {
margin : 0.8em 0 0 0;
color: #a08060;
background : url(images/terre.gif) no-repeat left top;
padding-left : 35px;
height:40px;
}
.post-title a {
color : #394558;
text-decoration : none;
}
.post-title a:hover {
color : #208060;
text-decoration : none;
}
.post-info {
font-size : 0.85em;
clear : both;
color : #999999;
margin : 0;
}
.post-chapo {
margin-bottom : 1em;
}
.post-content {
}
.post-info-co {
font-size : 0.85em;
clear : both;
background : transparent url(/images/ico_comments.png) no-repeat 0 40%;
padding-left : 13px;
}
.post-info a {color: #208060;}
.post-info a:hover{color : #666666;}
.post-info-co a {color: #208060;}
.post-info-co a:hover{color : #666666;}

#trackbacks {
}
#comments {
}
#comment-preview {
}

#trackbacks, #comments, #comment-preview {
margin : 0 2em;
}

#trackbacks blockquote, #comments blockquote, #comment-preview blockquote {
display : block;
margin : 0 0 1em 0;
padding : 1px 1em;
font-style : normal;
border : 1px solid #999;
color : #666;
background : transparent;
}

.comment-info {
margin : 0;
background : transparent url(images/ico_comments.png) no-repeat 0 40%;
padding-left : 13px;
}


/* Error messages
-------------------------------------------------------- */
.error {
border : 1px solid #c00;
background : #fee;
padding : 0.5em;
}
.error ul {
padding-left : 20px;
}
.error li {
list-style : square;
}


/* Interactions
-------------------------------------------------------- */
fieldset {
display : block;
border : none;
margin : 0;
padding : 0;
}

input, textarea {
font-family : Verdana,Arial,Geneva,Helvetica,sans-serif;
font-size : 1em;
border-width : 1px;
border-color : #ccc;
}

input[type], textarea[name] {
background: #FEF1D9;
}

input[type=submit], input[type=reset] {
background: #FEE7B9;
color : #000;
}

input[type=submit]:hover {
background : #208060;
color : #fff;
}

textarea {
width : 100%;
}

p.field {
margin : 0.5em 0 0 0;
}

p.field label {
display : block;
font-weight : bold;
font-size : 0.85em;
}

.spacer{
clear:both;
}
/* footer
-------------------------------------------------------- */
#footer {
clear:both;
margin:0em auto 0em auto;
padding:0.5em 0em 0.5em 0em;
text-align:center;
background: #208060;
color:#FFFFFF;
font-size: 12px;
}
#footer a{
color:#FFFFFF;
}

Configuration: Windows XP
Internet Explorer 6.0