diff --git a/themes/bootstrap/scss/_common.scss b/themes/bootstrap/scss/_common.scss
index bb6e76de9d..6dfd684f5a 100644
--- a/themes/bootstrap/scss/_common.scss
+++ b/themes/bootstrap/scss/_common.scss
@@ -1,7 +1,5 @@
 body {
-  padding: 0;
-  margin: 0;
-  margin-#{$left}: $navi-width;
+  text-align: $left;
 }
 
 #page_content {
diff --git a/themes/metro/scss/_common.scss b/themes/metro/scss/_common.scss
index bea5e2fbb5..97378b9c34 100644
--- a/themes/metro/scss/_common.scss
+++ b/themes/metro/scss/_common.scss
@@ -71,11 +71,6 @@
   display: none;
 }
 
-/* general tags */
-html {
-  font-size: 100%;
-}
-
 input,
 select,
 textarea {
@@ -83,10 +78,7 @@ textarea {
 }
 
 body {
-  padding: 0;
-  margin-#{$left}: $navi-width;
-  line-height: 1;
-  font-size: 11px;
+  text-align: $left;
 }
 
 /* Override style formats by html tags */
diff --git a/themes/metro/scss/_variables.scss b/themes/metro/scss/_variables.scss
index 6796e6f7f5..3c50961e49 100644
--- a/themes/metro/scss/_variables.scss
+++ b/themes/metro/scss/_variables.scss
@@ -161,7 +161,8 @@ $font-family-light: "Open Sans Light", "Segoe UI Light", "Segoe UI", sans-serif;
 $font-family-bold: "Open Sans Bold", sans-serif;
 $font-family-extra-bold: "Open Sans Extrabold", "Segoe Black", sans-serif;
 
-$font-size-base: 0.8rem;
+$font-size-base: 0.6875rem; // 11px
+$line-height-base: 1;
 
 // Buttons
 
diff --git a/themes/original/scss/_common.scss b/themes/original/scss/_common.scss
index ce8b141081..d3c210bad2 100644
--- a/themes/original/scss/_common.scss
+++ b/themes/original/scss/_common.scss
@@ -1,9 +1,3 @@
-// Common styles for the original theme
-
-html {
-  font-size: 82%;
-}
-
 input,
 select,
 textarea {
@@ -11,9 +5,7 @@ textarea {
 }
 
 body {
-  padding: 0;
-  margin: 0;
-  margin-#{$left}: 240px;
+  text-align: $left;
 }
 
 #page_content {
diff --git a/themes/original/scss/_variables.scss b/themes/original/scss/_variables.scss
index 19a02271ea..f2c3cf73fe 100644
--- a/themes/original/scss/_variables.scss
+++ b/themes/original/scss/_variables.scss
@@ -61,6 +61,8 @@ $body-color: $main-color;
 $font-family-base: sans-serif;
 $font-family-monospace: monospace;
 
+$font-size-base: 0.82rem;
+
 // Card
 
 $card-border-radius: 0;
diff --git a/themes/pmahomme/scss/_common.scss b/themes/pmahomme/scss/_common.scss
index 19967568d0..c840412f8d 100644
--- a/themes/pmahomme/scss/_common.scss
+++ b/themes/pmahomme/scss/_common.scss
@@ -1,12 +1,3 @@
-/**
- * Common styles for the pmahomme theme
- */
-
-/* general tags */
-html {
-  font-size: 82%;
-}
-
 input,
 select,
 textarea {
@@ -14,9 +5,7 @@ textarea {
 }
 
 body {
-  padding: 0;
-  margin: 0;
-  margin-#{$left}: $navi-width;
+  text-align: $left;
 }
 
 #page_content {
diff --git a/themes/pmahomme/scss/_variables.scss b/themes/pmahomme/scss/_variables.scss
index ad626e2469..1de9bac504 100644
--- a/themes/pmahomme/scss/_variables.scss
+++ b/themes/pmahomme/scss/_variables.scss
@@ -60,6 +60,8 @@ $body-color: $main-color;
 $font-family-base: sans-serif;
 $font-family-monospace: monospace;
 
+$font-size-base: 0.82rem;
+
 // Buttons
 
 $enable-gradients: true;