diff --git a/src/shared/themes/createTheme.ts b/src/shared/themes/createTheme.ts
index 15257ec..8df8e94 100644
--- a/src/shared/themes/createTheme.ts
+++ b/src/shared/themes/createTheme.ts
@@ -60,6 +60,8 @@ interface Settings {
    * Text color inside gutter.
    */
   gutterForeground: string
+
+  gutterBorderRight: string
 }
 
 export const createTheme = ({
@@ -89,6 +91,7 @@ export const createTheme = ({
       },
       ".cm-gutters": {
         backgroundColor: settings.gutterBackground,
+        borderRight: settings.gutterBorderRight,
         color: settings.gutterForeground,
       },
       ".cm-activeLineGutter": {
diff --git a/src/shared/themes/oneDark.ts b/src/shared/themes/oneDark.ts
index 1765325..716eeac 100644
--- a/src/shared/themes/oneDark.ts
+++ b/src/shared/themes/oneDark.ts
@@ -22,26 +22,6 @@ const chalky = "#e5c07b",
   selection = "#3E4451",
   cursor = "#528bff"
 
-/// The colors used in the theme, as CSS color strings.
-const color = {
-  chalky,
-  coral,
-  cyan,
-  invalid,
-  ivory,
-  stone,
-  malibu,
-  sage,
-  whiskey,
-  violet,
-  darkBackground,
-  highlightBackground,
-  background,
-  tooltipBackground,
-  selection,
-  cursor,
-}
-
 /// The editor theme styles for One Dark.
 const oneDarkTheme = EditorView.theme(
   {
diff --git a/src/shared/themes/smoothy.ts b/src/shared/themes/smoothy.ts
index a2a98d0..b58cdc6 100644
--- a/src/shared/themes/smoothy.ts
+++ b/src/shared/themes/smoothy.ts
@@ -11,6 +11,7 @@ export const smoothy = createTheme({
     selection: "#FFFD0054",
     gutterBackground: "#FFFFFF",
     gutterForeground: "#00000070",
+    gutterBorderRight: "none",
     lineHighlight: "#00000008",
   },
   styles: [