diff --git a/app/javascript/styles/mailer.scss b/app/javascript/styles/mailer.scss
index dbe070f9a..d83bd4d96 100644
--- a/app/javascript/styles/mailer.scss
+++ b/app/javascript/styles/mailer.scss
@@ -169,7 +169,7 @@ p {
   font-family: Helvetica, Arial, sans-serif;
 
   @media only screen {
-    font-family: 'mastodon-font-sans-serif', sans-serif !important;
+    font-family: $font-sans-serif, sans-serif !important;
   }
 }
 
diff --git a/app/javascript/styles/mastodon/about.scss b/app/javascript/styles/mastodon/about.scss
index 228dd96f0..dc456be3e 100644
--- a/app/javascript/styles/mastodon/about.scss
+++ b/app/javascript/styles/mastodon/about.scss
@@ -16,7 +16,7 @@ $small-breakpoint: 960px;
 }
 
 .rich-formatting {
-  font-family: 'mastodon-font-sans-serif', sans-serif;
+  font-family: $font-sans-serif, sans-serif;
   font-size: 16px;
   font-weight: 400;
   font-size: 16px;
@@ -31,7 +31,7 @@ $small-breakpoint: 960px;
 
   p,
   li {
-    font-family: 'mastodon-font-sans-serif', sans-serif;
+    font-family: $font-sans-serif, sans-serif;
     font-size: 16px;
     font-weight: 400;
     font-size: 16px;
@@ -62,7 +62,7 @@ $small-breakpoint: 960px;
   }
 
   h1 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 26px;
     line-height: 30px;
     font-weight: 500;
@@ -70,7 +70,7 @@ $small-breakpoint: 960px;
     color: $secondary-text-color;
 
     small {
-      font-family: 'mastodon-font-sans-serif', sans-serif;
+      font-family: $font-sans-serif, sans-serif;
       display: block;
       font-size: 18px;
       font-weight: 400;
@@ -79,7 +79,7 @@ $small-breakpoint: 960px;
   }
 
   h2 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 22px;
     line-height: 26px;
     font-weight: 500;
@@ -88,7 +88,7 @@ $small-breakpoint: 960px;
   }
 
   h3 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 18px;
     line-height: 24px;
     font-weight: 500;
@@ -97,7 +97,7 @@ $small-breakpoint: 960px;
   }
 
   h4 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 16px;
     line-height: 24px;
     font-weight: 500;
@@ -106,7 +106,7 @@ $small-breakpoint: 960px;
   }
 
   h5 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 14px;
     line-height: 24px;
     font-weight: 500;
@@ -115,7 +115,7 @@ $small-breakpoint: 960px;
   }
 
   h6 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 12px;
     line-height: 24px;
     font-weight: 500;
@@ -180,7 +180,7 @@ $small-breakpoint: 960px;
 
   &__section {
     flex: 1 0 0;
-    font-family: 'mastodon-font-sans-serif', sans-serif;
+    font-family: $font-sans-serif, sans-serif;
     font-size: 16px;
     line-height: 28px;
     color: $primary-text-color;
@@ -221,7 +221,7 @@ $small-breakpoint: 960px;
     bottom: -40px;
 
     .panel-header {
-      font-family: 'mastodon-font-display', sans-serif;
+      font-family: $font-display, sans-serif;
       font-size: 14px;
       line-height: 24px;
       font-weight: 500;
@@ -450,7 +450,7 @@ $small-breakpoint: 960px;
 
   p,
   li {
-    font-family: 'mastodon-font-sans-serif', sans-serif;
+    font-family: $font-sans-serif, sans-serif;
     font-size: 16px;
     font-weight: 400;
     font-size: 16px;
@@ -499,7 +499,7 @@ $small-breakpoint: 960px;
   }
 
   h1 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 26px;
     line-height: 30px;
     font-weight: 500;
@@ -507,7 +507,7 @@ $small-breakpoint: 960px;
     color: $secondary-text-color;
 
     small {
-      font-family: 'mastodon-font-sans-serif', sans-serif;
+      font-family: $font-sans-serif, sans-serif;
       display: block;
       font-size: 18px;
       font-weight: 400;
@@ -516,7 +516,7 @@ $small-breakpoint: 960px;
   }
 
   h2 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 22px;
     line-height: 26px;
     font-weight: 500;
@@ -525,7 +525,7 @@ $small-breakpoint: 960px;
   }
 
   h3 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 18px;
     line-height: 24px;
     font-weight: 500;
@@ -534,7 +534,7 @@ $small-breakpoint: 960px;
   }
 
   h4 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 16px;
     line-height: 24px;
     font-weight: 500;
@@ -543,7 +543,7 @@ $small-breakpoint: 960px;
   }
 
   h5 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 14px;
     line-height: 24px;
     font-weight: 500;
@@ -552,7 +552,7 @@ $small-breakpoint: 960px;
   }
 
   h6 {
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     font-size: 12px;
     line-height: 24px;
     font-weight: 500;
@@ -619,7 +619,7 @@ $small-breakpoint: 960px;
 
       .hero .heading {
         padding-bottom: 20px;
-        font-family: 'mastodon-font-sans-serif', sans-serif;
+        font-family: $font-sans-serif, sans-serif;
         font-size: 16px;
         font-weight: 400;
         font-size: 16px;
@@ -670,7 +670,7 @@ $small-breakpoint: 960px;
         text-decoration: none;
         padding: 12px 16px;
         line-height: 32px;
-        font-family: 'mastodon-font-display', sans-serif;
+        font-family: $font-display, sans-serif;
         font-weight: 500;
         font-size: 14px;
 
@@ -743,7 +743,7 @@ $small-breakpoint: 960px;
   .about-short {
     background: darken($ui-base-color, 4%);
     padding: 50px 0 30px;
-    font-family: 'mastodon-font-sans-serif', sans-serif;
+    font-family: $font-sans-serif, sans-serif;
     font-size: 16px;
     font-weight: 400;
     font-size: 16px;
@@ -1012,7 +1012,7 @@ $small-breakpoint: 960px;
     display: flex;
     -webkit-overflow-scrolling: touch;
     -ms-overflow-style: -ms-autohiding-scrollbar;
-    font-family: 'mastodon-font-sans-serif', sans-serif;
+    font-family: $font-sans-serif, sans-serif;
     font-size: 13px;
     line-height: 18px;
     font-weight: 400;
diff --git a/app/javascript/styles/mastodon/admin.scss b/app/javascript/styles/mastodon/admin.scss
index 9dfd89dc2..b6c771abf 100644
--- a/app/javascript/styles/mastodon/admin.scss
+++ b/app/javascript/styles/mastodon/admin.scss
@@ -432,7 +432,7 @@ $no-columns-breakpoint: 600px;
     border-radius: 0 0 4px 4px;
     padding: 10px;
     color: $darker-text-color;
-    font-family: 'mastodon-font-monospace', monospace;
+    font-family: $font-monospace, monospace;
     font-size: 12px;
     word-wrap: break-word;
     min-height: 20px;
diff --git a/app/javascript/styles/mastodon/basics.scss b/app/javascript/styles/mastodon/basics.scss
index 3bbb31e6e..746def625 100644
--- a/app/javascript/styles/mastodon/basics.scss
+++ b/app/javascript/styles/mastodon/basics.scss
@@ -6,7 +6,7 @@
 }
 
 body {
-  font-family: 'mastodon-font-sans-serif', sans-serif;
+  font-family: $font-sans-serif, sans-serif;
   background: darken($ui-base-color, 8%);
   font-size: 13px;
   line-height: 18px;
@@ -29,8 +29,8 @@ body {
     // Fira Sans => Firefox OS
     // Droid Sans => Older Androids (<4.0)
     // Helvetica Neue => Older macOS <10.11
-    // mastodon-font-sans-serif => web-font (Roboto) fallback and newer Androids (>=4.0)
-    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", mastodon-font-sans-serif, sans-serif;
+    // $font-sans-serif => web-font (Roboto) fallback and newer Androids (>=4.0)
+    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", $font-sans-serif, sans-serif;
   }
 
   &.app-body {
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 9421523bd..3fb924aa4 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -552,7 +552,7 @@
 
       .character-counter {
         cursor: default;
-        font-family: 'mastodon-font-sans-serif', sans-serif;
+        font-family: $font-sans-serif, sans-serif;
         font-size: 14px;
         font-weight: 600;
         color: $lighter-text-color;
@@ -5122,7 +5122,7 @@ noscript {
       width: 100%;
       border: none;
       padding: 10px;
-      font-family: 'mastodon-font-monospace', monospace;
+      font-family: $font-monospace, monospace;
       background: $ui-base-color;
       color: $primary-text-color;
       font-size: 14px;
diff --git a/app/javascript/styles/mastodon/containers.scss b/app/javascript/styles/mastodon/containers.scss
index 47582f323..44fc1e538 100644
--- a/app/javascript/styles/mastodon/containers.scss
+++ b/app/javascript/styles/mastodon/containers.scss
@@ -37,7 +37,7 @@
       outline: 0;
       padding: 12px 16px;
       line-height: 32px;
-      font-family: 'mastodon-font-display', sans-serif;
+      font-family: $font-display, sans-serif;
       font-weight: 500;
       font-size: 14px;
     }
@@ -627,7 +627,7 @@
             font-size: 18px;
             margin-bottom: 5px;
             color: $primary-text-color;
-            font-family: 'mastodon-font-display', sans-serif;
+            font-family: $font-display, sans-serif;
           }
         }
 
diff --git a/app/javascript/styles/mastodon/dashboard.scss b/app/javascript/styles/mastodon/dashboard.scss
index 949ca733f..86cf6c61b 100644
--- a/app/javascript/styles/mastodon/dashboard.scss
+++ b/app/javascript/styles/mastodon/dashboard.scss
@@ -35,7 +35,7 @@
     font-weight: 500;
     font-size: 24px;
     color: $primary-text-color;
-    font-family: 'mastodon-font-display', sans-serif;
+    font-family: $font-display, sans-serif;
     margin-bottom: 20px;
   }
 
diff --git a/app/javascript/styles/mastodon/forms.scss b/app/javascript/styles/mastodon/forms.scss
index cbd3de94c..be2bf7cea 100644
--- a/app/javascript/styles/mastodon/forms.scss
+++ b/app/javascript/styles/mastodon/forms.scss
@@ -1,7 +1,7 @@
 $no-columns-breakpoint: 600px;
 
 code {
-  font-family: 'mastodon-font-monospace', monospace;
+  font-family: $font-monospace, monospace;
   font-weight: 400;
 }
 
@@ -474,7 +474,7 @@ code {
     width: 100%;
     border: none;
     padding: 10px;
-    font-family: 'mastodon-font-monospace', monospace;
+    font-family: $font-monospace, monospace;
     background: $ui-base-color;
     color: $primary-text-color;
     font-size: 14px;
@@ -718,7 +718,7 @@ code {
 .form_admin_settings_custom_css,
 .form_admin_settings_closed_registrations_message {
   textarea {
-    font-family: 'mastodon-font-monospace', monospace;
+    font-family: $font-monospace, monospace;
   }
 }
 
@@ -742,7 +742,7 @@ code {
     border: 0;
     padding: 10px;
     font-size: 14px;
-    font-family: 'mastodon-font-monospace', monospace;
+    font-family: $font-monospace, monospace;
   }
 
   button {
diff --git a/app/javascript/styles/mastodon/tables.scss b/app/javascript/styles/mastodon/tables.scss
index c2206cf55..adb75afe5 100644
--- a/app/javascript/styles/mastodon/tables.scss
+++ b/app/javascript/styles/mastodon/tables.scss
@@ -90,7 +90,7 @@
 }
 
 samp {
-  font-family: 'mastodon-font-monospace', monospace;
+  font-family: $font-monospace, monospace;
 }
 
 button.table-action-link {
diff --git a/app/javascript/styles/mastodon/variables.scss b/app/javascript/styles/mastodon/variables.scss
index 009f0a3c9..a82c44229 100644
--- a/app/javascript/styles/mastodon/variables.scss
+++ b/app/javascript/styles/mastodon/variables.scss
@@ -48,3 +48,7 @@ $media-modal-media-max-width: 100%;
 $media-modal-media-max-height: 80%;
 
 $no-gap-breakpoint: 415px;
+
+$font-sans-serif: 'mastodon-font-sans-serif' !default;
+$font-display: 'mastodon-font-display' !default;
+$font-monospace: 'mastodon-font-monospace' !default;