diff --git a/app/assets/stylesheets/layout.scss b/app/assets/stylesheets/layout.scss
index d94a1224b..2cbd47922 100644
--- a/app/assets/stylesheets/layout.scss
+++ b/app/assets/stylesheets/layout.scss
@@ -33,6 +33,10 @@
   @include normal-selection;
 }
 
+html {
+  font-size: calc(0.25em + Max(0.75em, 0.75vw));
+}
+
 html,
 body {
   height: 100%;