diff --git a/themes/bootstrap/scss/_common.scss b/themes/bootstrap/scss/_common.scss
index 701956170e..79b55c5c7e 100644
--- a/themes/bootstrap/scss/_common.scss
+++ b/themes/bootstrap/scss/_common.scss
@@ -1450,6 +1450,8 @@ label.desc {
 }
 
 code {
+  font-size: 1em;
+
   &.php {
     display: block;
     padding-#{$left}: 1em;
diff --git a/themes/metro/scss/_common.scss b/themes/metro/scss/_common.scss
index ad944f6aca..176d6680b5 100644
--- a/themes/metro/scss/_common.scss
+++ b/themes/metro/scss/_common.scss
@@ -1446,6 +1446,7 @@ kbd {
 }
 
 code {
+  font-size: 1em;
   color: $main-color;
 
   &.php {
diff --git a/themes/original/scss/_common.scss b/themes/original/scss/_common.scss
index 25e0c073d8..b85098f558 100644
--- a/themes/original/scss/_common.scss
+++ b/themes/original/scss/_common.scss
@@ -1162,6 +1162,7 @@ kbd {
 }
 
 code {
+  font-size: 1em;
   color: $main-color;
 
   &.php {