Change code font size from 0.79em to 0.77em

Adjusted the code font size for better readability.

Author: MatheusDS4

theme/css/variables.css

@@ -12,7 +12,7 @@
     --font: "Crimson Pro", "Cambria", sans-serif;
     --ui-font: "Noto Sans", "Segoe UI", sans-serif;
     --mono-font: "Nimbus Mono", "Courier New", monospace;
-    --code-font-size: 0.79em; /* please adjust the ace font size accordingly in editor.js */
+    --code-font-size: 0.77em; /* please adjust the ace font size accordingly in editor.js */
 }
 
 /* Themes */
@@ -66,4 +66,4 @@
     --copy-button-filter-hover: invert(68%) sepia(55%) saturate(531%) hue-rotate(341deg) brightness(104%) contrast(101%);
 
     --footnote-highlight: #2668a6;
-}
+}