diff --git a/backend/private/style.css b/backend/private/style.css
index 17a02e609..851b7fbe5 100644
--- a/backend/private/style.css
+++ b/backend/private/style.css
@@ -12,7 +12,7 @@
 }
 
 body {
-  font-family: "Roboto Mono", sans-serif;
+  font-family: "Roboto Mono", monospace;
   margin: 0;
   padding: 0;
   background: var(--bg-color);
@@ -62,7 +62,7 @@ body {
   cursor: pointer;
   font-size: 1rem;
   margin-right: 1rem;
-  font-family: "Roboto Mono";
+  font-family: "Roboto Mono", monospace;
 }
 
 .array-input {
@@ -117,7 +117,7 @@ label {
   transition: all 0.2s ease-in-out;
   font-size: 1rem;
   padding: 0.25rem;
-  font-family: "Roboto Mono";
+  font-family: "Roboto Mono", monospace;
 }
 
 input[type="checkbox"] {
diff --git a/frontend/src/styles/core.scss b/frontend/src/styles/core.scss
index bcaf4a5ec..1f2d7fd0b 100644
--- a/frontend/src/styles/core.scss
+++ b/frontend/src/styles/core.scss
@@ -1,6 +1,6 @@
 :root {
   --roundness: 0.5rem;
-  --font: "Roboto Mono", "Vazirmatn", sans-serif;
+  --font: "Roboto Mono", "Vazirmatn", monospace;
   // scroll-behavior: smooth;
   scroll-padding-top: 2rem;
   font-weight: 400;
diff --git a/frontend/src/styles/nav.scss b/frontend/src/styles/nav.scss
index 7acf76712..86e8df328 100644
--- a/frontend/src/styles/nav.scss
+++ b/frontend/src/styles/nav.scss
@@ -185,7 +185,7 @@
       position: relative;
       font-size: 2rem;
       line-height: 2rem;
-      font-family: "Lexend Deca";
+      font-family: "Lexend Deca", sans-serif;
       transition: color 0.25s;
       font-weight: unset;
       margin-block-start: unset;
diff --git a/frontend/src/ts/config.ts b/frontend/src/ts/config.ts
index 7942b5a18..e3d3991b4 100644
--- a/frontend/src/ts/config.ts
+++ b/frontend/src/ts/config.ts
@@ -1248,7 +1248,7 @@ export function setFontFamily(font: string, nosave?: boolean): boolean {
   config.fontFamily = font;
   document.documentElement.style.setProperty(
     "--font",
-    `"${font.replace(/_/g, " ")}", "Roboto Mono", "Vazirmatn"`
+    `"${font.replace(/_/g, " ")}", "Roboto Mono", "Vazirmatn", monospace`
   );
   saveToLocalStorage("fontFamily", nosave);
   ConfigEvent.dispatch("fontFamily", config.fontFamily);