diff --git a/htdocs/theme/amarok/style.css.php b/htdocs/theme/amarok/style.css.php
index 80f64e41561..591feac5fca 100644
--- a/htdocs/theme/amarok/style.css.php
+++ b/htdocs/theme/amarok/style.css.php
@@ -320,6 +320,7 @@ th .button {
 }
 .center {
     text-align: center;
+	margin: 0px auto;
 }
 .left {
 	text-align: <?php print $left; ?>;
@@ -458,6 +459,10 @@ div.tmenu ul li a.tmenusel {/* texte du menu principal sélectionné */
 
 body.body center { color:white; margin-top: 100px; }
 
+.login_vertical_align {
+	padding: 10px;
+}
+
 form#login {
 	border:solid 1px rgba(0,0,0,.4);
 	border-top:solid 1px #ffffff;
@@ -515,6 +520,10 @@ form#login table.login_table {
 	background:none !important;
 }
 
+.login_main_message {
+	text-align: center;
+}
+
 div#login_left, div#login_right {
 	display: inline-block;
 	min-width: 220px;
@@ -522,7 +531,7 @@ div#login_left, div#login_right {
 	vertical-align: middle;
 }
 
-table.login_table { background-color: red  !important;}
+table.login_table { margin: 0px auto; background-color: red  !important;}
 table.login_table tr td {vertical-align:middle;}
 table.login_table tr.vmenu td {font-size:18px;}
 table.login_table tr td a {color:#333333 !important;}
diff --git a/htdocs/theme/auguria/style.css.php b/htdocs/theme/auguria/style.css.php
index d1dd0ab4091..5e2af9e2eb2 100644
--- a/htdocs/theme/auguria/style.css.php
+++ b/htdocs/theme/auguria/style.css.php
@@ -226,6 +226,7 @@ div.floatright
 }
 .center {
     text-align: center;
+	margin: 0px auto;
 }
 .left {
 	text-align: <?php print $left; ?>;
@@ -542,7 +543,9 @@ foreach($mainmenuusedarray as $val)
 
 
 /* Login */
-
+.login_vertical_align {
+	padding: 10px;
+}
 form#login {
 	margin-top: <?php echo $dol_optimize_smallscreen?'30':'60' ?>px;
 	margin-bottom: 30px;
@@ -557,9 +560,8 @@ form#login {
 	text-shadow: 1px 1px 1px #FFF;
 }
 .login_table {
-	padding:12px;
-	margin-left: 10px;
-	margin-right: 10px;
+	padding: 12px;
+	margin: 0px auto;  /* Center */
 	max-width: 540px;
 	border: 1px solid #C0C0C0;
 	background-color: #E0E0E0;
diff --git a/htdocs/theme/bureau2crea/style.css.php b/htdocs/theme/bureau2crea/style.css.php
index eee7afcb9c0..f74326d908d 100644
--- a/htdocs/theme/bureau2crea/style.css.php
+++ b/htdocs/theme/bureau2crea/style.css.php
@@ -251,6 +251,7 @@ div.floatright
 }
 .center {
     text-align: center;
+	margin: 0px auto;
 }
 .left {
 	text-align: <?php print $left; ?>;
@@ -566,15 +567,19 @@ li.tmenu a.tmenudisabled {
 
 
 /* Login */
-
+.login_vertical_align {
+	padding: 10px;
+}
+.login_main_message {
+	text-align: center;
+}
 form#login {
 	margin-top: <?php echo $dol_optimize_smallscreen?'30':'60' ?>px;
 	margin-bottom: 30px;
 	font-size: 13px;
 }
 .login_table_title {
-	margin-left: 10px;
-	margin-right: 10px;
+	margin: 0px auto;
 	max-width: 540px;
 	color: #888888;
 	text-shadow: 1px 1px 1px #FFF;
@@ -583,8 +588,7 @@ form#login {
 	text-shadow: 1px 1px 1px #FFF;
 }
 .login_table {
-	margin-left: 10px;
-	margin-right: 10px;
+	margin: 0px auto;  /* Center */
 	padding:12px;
 	max-width: 540px;
 	border: 1px solid #C0C0C0;
diff --git a/htdocs/theme/cameleo/style.css.php b/htdocs/theme/cameleo/style.css.php
index 4b8955953bd..0fcecf98e32 100644
--- a/htdocs/theme/cameleo/style.css.php
+++ b/htdocs/theme/cameleo/style.css.php
@@ -227,6 +227,7 @@ div.floatright
 }
 .center {
     text-align: center;
+	margin: 0px auto;
 }
 .left {
 	text-align: <?php print $left; ?>;
@@ -637,7 +638,12 @@ foreach($mainmenuusedarray as $val)
 
 
 /* Login */
-
+.login_vertical_align {
+	padding: 10px;
+}
+.login_main_message {
+	text-align: center;
+}
 form#login {
 	margin-top: <?php echo $dol_optimize_smallscreen?'30':'60' ?>px;
 	margin-bottom: 30px;
@@ -652,8 +658,7 @@ form#login {
 	text-shadow: 1px 1px 1px #FFF;
 }
 .login_table {
-	margin-left: 10px;
-	margin-right: 10px;
+	margin: 0px auto;  /* Center */
 	padding:12px;
 	max-width: 540px;
 	border: 1px solid #C0C0C0;
diff --git a/htdocs/theme/md_exp/style.css.php b/htdocs/theme/md_exp/style.css.php
index bd70786dab4..fb84b7341e1 100644
--- a/htdocs/theme/md_exp/style.css.php
+++ b/htdocs/theme/md_exp/style.css.php
@@ -401,6 +401,7 @@ textarea.centpercent {
 }
 .center {
     text-align: center;
+	margin: 0px auto;
 }
 .left {
 	text-align: <?php print $left; ?>;
@@ -598,8 +599,8 @@ div.ficheaddleft {
 	else print "margin-top: 10px;\n"; ?>
 }
 .containercenter {
-display : table;
-margin : 0px auto;
+	display : table;
+	margin : 0px auto;
 }
 
 #pictotitle {
@@ -912,8 +913,7 @@ form#login {
 	text-shadow: 1px 1px 1px #FFF;
 }
 .login_table {
-	margin-left: 10px;
-	margin-right: 10px;
+	margin: 0px auto;  /* Center */
 	padding-left:6px;
 	padding-right:6px;
 	padding-top:16px;