diff --git a/apps/client/src/stylesheets/theme-dark.css b/apps/client/src/stylesheets/theme-dark.css
index a6aab3118..f56e73232 100644
--- a/apps/client/src/stylesheets/theme-dark.css
+++ b/apps/client/src/stylesheets/theme-dark.css
@@ -1,16 +1,16 @@
 :root {
     --theme-style: dark;
 
-    --main-font-family: Montserrat;
+    --main-font-family: Montserrat, sans-serif;
     --main-font-size: normal;
 
-    --tree-font-family: Montserrat;
+    --tree-font-family: Montserrat, sans-serif;
     --tree-font-size: normal;
 
-    --detail-font-family: Montserrat;
+    --detail-font-family: Montserrat, sans-serif;
     --detail-font-size: normal;
 
-    --monospace-font-family: JetBrainsLight;
+    --monospace-font-family: JetBrainsLight, monospace;
     --monospace-font-size: normal;
 
     --main-background-color: #333;
diff --git a/apps/client/src/stylesheets/theme-light.css b/apps/client/src/stylesheets/theme-light.css
index b485e8a27..7aca1b3f9 100644
--- a/apps/client/src/stylesheets/theme-light.css
+++ b/apps/client/src/stylesheets/theme-light.css
@@ -5,16 +5,16 @@ html {
     /* either light or dark, colored theme with darker tones are also dark, used e.g. for note map node colors */
     --theme-style: light;
 
-    --main-font-family: Montserrat;
+    --main-font-family: Montserrat, sans-serif;
     --main-font-size: normal;
 
-    --tree-font-family: Montserrat;
+    --tree-font-family: Montserrat, sans-serif;
     --tree-font-size: normal;
 
-    --detail-font-family: Montserrat;
+    --detail-font-family: Montserrat, sans-serif;
     --detail-font-size: normal;
 
-    --monospace-font-family: JetBrainsLight;
+    --monospace-font-family: JetBrainsLight, monospace;
     --monospace-font-size: normal;
 
     --main-background-color: white;
diff --git a/apps/client/src/stylesheets/theme-next/base.css b/apps/client/src/stylesheets/theme-next/base.css
index a75ff689b..0e6f7f127 100644
--- a/apps/client/src/stylesheets/theme-next/base.css
+++ b/apps/client/src/stylesheets/theme-next/base.css
@@ -26,7 +26,7 @@
     --detail-font-family: var(--main-font-family);
     --detail-font-size: normal;
 
-    --monospace-font-family: JetBrainsLight;
+    --monospace-font-family: JetBrainsLight, monospace;
     --monospace-font-size: normal;
 
     --left-pane-item-selected-shadow-size: 2px;