diff --git a/templates/html/common-blue/zim-pres-variables.css b/templates/html/common-blue/zim-pres-variables.css
index 9258ed7..2590ea2 100644
--- a/templates/html/common-blue/zim-pres-variables.css
+++ b/templates/html/common-blue/zim-pres-variables.css
@@ -12,4 +12,5 @@
         --main-pres-img-height: 8em;                /* Size of image height                  */
         --main-pres-table-font-size: 80%;           /* Relative font-size in tables          */
         --main-pres-code-font-size: 70%;            /* Relative font-size in code            */
+        --main-pres-font-scale: 1.0;                /* Global font factor                    */
     }
diff --git a/templates/html/common-wize/zim-pres-variables.css b/templates/html/common-wize/zim-pres-variables.css
index df2b102..e3a88d5 100644
--- a/templates/html/common-wize/zim-pres-variables.css
+++ b/templates/html/common-wize/zim-pres-variables.css
@@ -12,4 +12,5 @@
         --main-pres-img-height: 8em;                /* Size of image height                  */
         --main-pres-table-font-size: 80%;           /* Relative font-size in tables          */
         --main-pres-code-font-size: 70%;            /* Relative font-size in code            */
+        --main-pres-font-scale: 1.0;                /* Global font factor                    */
     }