diff --git a/app/javascript/styles/contrast/variables.scss b/app/javascript/styles/contrast/variables.scss
index e38d24b271..766591ba40 100644
--- a/app/javascript/styles/contrast/variables.scss
+++ b/app/javascript/styles/contrast/variables.scss
@@ -1,10 +1,10 @@
 // Dependent colors
 $black: #000000;
 
-$classic-base-color: #282c37;
-$classic-primary-color: #9baec8;
-$classic-secondary-color: #d9e1e8;
-$classic-highlight-color: #6364ff;
+$classic-base-color: hsl(240deg, 16%, 19%);
+$classic-primary-color: hsl(240deg, 29%, 70%);
+$classic-secondary-color: hsl(255deg, 25%, 88%);
+$classic-highlight-color: hsl(240deg, 100%, 69%);
 
 $ui-base-color: $classic-base-color !default;
 $ui-primary-color: $classic-primary-color !default;
diff --git a/app/javascript/styles/mastodon-light/variables.scss b/app/javascript/styles/mastodon-light/variables.scss
index 39809b437f..76ede26233 100644
--- a/app/javascript/styles/mastodon-light/variables.scss
+++ b/app/javascript/styles/mastodon-light/variables.scss
@@ -2,25 +2,25 @@
 $black: #000000;
 $white: #ffffff;
 
-$classic-base-color: #282c37;
-$classic-primary-color: #9baec8;
-$classic-secondary-color: #d9e1e8;
-$classic-highlight-color: #6364ff;
+$classic-base-color: hsl(240deg, 16%, 19%);
+$classic-primary-color: hsl(240deg, 29%, 70%);
+$classic-secondary-color: hsl(255deg, 25%, 88%);
+$classic-highlight-color: hsl(240deg, 100%, 69%);
 
-$blurple-600: #563acc; // Iris
-$blurple-500: #6364ff; // Brand purple
-$blurple-300: #858afa; // Faded Blue
-$grey-600: #4e4c5a; // Trout
-$grey-100: #dadaf3; // Topaz
+$blurple-600: hsl(252deg, 59%, 51%); // Iris
+$blurple-500: hsl(240deg, 100%, 69%); // Brand purple
+$blurple-300: hsl(237deg, 92%, 75%); // Faded Blue
+$grey-600: hsl(240deg, 8%, 33%); // Trout
+$grey-100: hsl(240deg, 51%, 90%); // Topaz
 
 // Differences
-$success-green: lighten(#3c754d, 8%);
+$success-green: lighten(hsl(138deg, 32%, 35%), 8%);
 
 $base-overlay-background: $white !default;
 $valid-value-color: $success-green !default;
 
 $ui-base-color: $classic-secondary-color !default;
-$ui-base-lighter-color: #b0c0cf;
+$ui-base-lighter-color: hsl(250deg, 24%, 75%);
 $ui-primary-color: $classic-primary-color !default;
 $ui-secondary-color: $classic-base-color !default;
 $ui-highlight-color: $classic-highlight-color !default;
@@ -35,12 +35,12 @@ $ui-button-tertiary-border-color: $blurple-500 !default;
 $primary-text-color: $black !default;
 $darker-text-color: $classic-base-color !default;
 $highlight-text-color: $ui-highlight-color !default;
-$dark-text-color: #444b5d;
-$action-button-color: #606984;
+$dark-text-color: hsl(240deg, 16%, 32%);
+$action-button-color: hsl(240deg, 16%, 45%);
 
 $inverted-text-color: $black !default;
 $lighter-text-color: $classic-base-color !default;
-$light-text-color: #444b5d;
+$light-text-color: hsl(240deg, 16%, 32%);
 
 // Newly added colors
 $account-background-color: $white !default;
@@ -57,11 +57,11 @@ $account-background-color: $white !default;
 $emojis-requiring-inversion: 'chains';
 
 body {
-  --dropdown-border-color: #d9e1e8;
+  --dropdown-border-color: hsl(240deg, 25%, 88%);
   --dropdown-background-color: #fff;
-  --modal-border-color: #d9e1e8;
+  --modal-border-color: hsl(240deg, 25%, 88%);
   --modal-background-color: var(--background-color-tint);
-  --background-border-color: #d9e1e8;
+  --background-border-color: hsl(240deg, 25%, 88%);
   --background-color: #fff;
   --background-color-tint: rgba(255, 255, 255, 80%);
   --background-filter: blur(10px);
diff --git a/app/javascript/styles/mastodon/variables.scss b/app/javascript/styles/mastodon/variables.scss
index c8271e0dcd..c477e7a750 100644
--- a/app/javascript/styles/mastodon/variables.scss
+++ b/app/javascript/styles/mastodon/variables.scss
@@ -7,8 +7,8 @@ $blurple-600: #563acc; // Iris
 $blurple-500: #6364ff; // Brand purple
 $blurple-400: #7477fd; // Medium slate blue
 $blurple-300: #858afa; // Faded Blue
-$grey-600: #4e4c5a; // Trout
-$grey-100: #dadaf3; // Topaz
+$grey-600: hsl(240deg, 8%, 33%); // Trout
+$grey-100: hsl(240deg, 51%, 90%); // Topaz
 
 $success-green: #79bd9a !default; // Padua
 $error-red: $red-500 !default; // Cerise
@@ -18,10 +18,10 @@ $gold-star: #ca8f04 !default; // Dark Goldenrod
 $red-bookmark: $warning-red;
 
 // Values from the classic Mastodon UI
-$classic-base-color: #282c37; // Midnight Express
-$classic-primary-color: #9baec8; // Echo Blue
-$classic-secondary-color: #d9e1e8; // Pattens Blue
-$classic-highlight-color: #6364ff; // Brand purple
+$classic-base-color: hsl(240deg, 16%, 19%);
+$classic-primary-color: hsl(240deg, 29%, 70%);
+$classic-secondary-color: hsl(255deg, 25%, 88%);
+$classic-highlight-color: $blurple-500;
 
 // Variables for defaults in UI
 $base-shadow-color: $black !default;
diff --git a/app/lib/themes.rb b/app/lib/themes.rb
index 183258d62f..8b68c92e45 100644
--- a/app/lib/themes.rb
+++ b/app/lib/themes.rb
@@ -7,7 +7,7 @@ class Themes
   include Singleton
 
   THEME_COLORS = {
-    dark: '#191b22',
+    dark: '#181820',
     light: '#ffffff',
   }.freeze