set $font-size-base

packages/app/src/styles/_layout.scss

@@ -1,10 +1,6 @@
 @use './variables' as var;
 @use './bootstrap/init' as bs;
 
-:root {
-  font-size: var.$font-size-root;
-}
-
 body {
   overflow-y: scroll !important;
   overscroll-behavior-y: none;

packages/app/src/styles/_variables.scss

@@ -1,5 +1,3 @@
-$font-size-root: 14px;
-
 //== GROWI Official Color
 $growi-green: #74bc46;
 $growi-blue: #175fa5;

packages/app/src/styles/bootstrap/_variables.scss

@@ -70,6 +70,7 @@ $font-family-serif: Georgia, 'Times New Roman', Times, serif;
 $font-family-monospace: SFMono-Regular, Consolas, Liberation Mono, Menlo, monospace;
 $font-family-base: $font-family-sans-serif;
 
+$font-size-base: 0.875rem;  // 16px -> 14px
 $line-height-base: 1.42857;
 
 $blockquote-small-color: $gray-500;