diff --git a/frontend/src/App/App.js b/frontend/src/App/App.js
index 41691a823..5715dd3e3 100644
--- a/frontend/src/App/App.js
+++ b/frontend/src/App/App.js
@@ -12,11 +12,10 @@ function App({ store, history }) {
     <DocumentTitle title={window.Radarr.instanceName}>
       <Provider store={store}>
         <ConnectedRouter history={history}>
-          <ApplyTheme>
-            <PageConnector>
-              <AppRoutes app={App} />
-            </PageConnector>
-          </ApplyTheme>
+          <ApplyTheme />
+          <PageConnector>
+            <AppRoutes app={App} />
+          </PageConnector>
         </ConnectedRouter>
       </Provider>
     </DocumentTitle>
diff --git a/frontend/src/App/ApplyTheme.js b/frontend/src/App/ApplyTheme.js
deleted file mode 100644
index dbec3bde2..000000000
--- a/frontend/src/App/ApplyTheme.js
+++ /dev/null
@@ -1,49 +0,0 @@
-import PropTypes from 'prop-types';
-import React, { Fragment, useCallback, useEffect } from 'react';
-import { connect } from 'react-redux';
-import { createSelector } from 'reselect';
-import themes from 'Styles/Themes';
-
-function createMapStateToProps() {
-  return createSelector(
-    (state) => state.settings.ui.item.theme || window.Radarr.theme,
-    (
-      theme
-    ) => {
-      return {
-        theme
-      };
-    }
-  );
-}
-
-function ApplyTheme({ theme, children }) {
-  // Update the CSS Variables
-  const updateCSSVariables = useCallback(() => {
-    const arrayOfVariableKeys = Object.keys(themes[theme]);
-    const arrayOfVariableValues = Object.values(themes[theme]);
-
-    // Loop through each array key and set the CSS Variables
-    arrayOfVariableKeys.forEach((cssVariableKey, index) => {
-      // Based on our snippet from MDN
-      document.documentElement.style.setProperty(
-        `--${cssVariableKey}`,
-        arrayOfVariableValues[index]
-      );
-    });
-  }, [theme]);
-
-  // On Component Mount and Component Update
-  useEffect(() => {
-    updateCSSVariables(theme);
-  }, [updateCSSVariables, theme]);
-
-  return <Fragment>{children}</Fragment>;
-}
-
-ApplyTheme.propTypes = {
-  theme: PropTypes.string.isRequired,
-  children: PropTypes.object.isRequired
-};
-
-export default connect(createMapStateToProps)(ApplyTheme);
diff --git a/frontend/src/App/ApplyTheme.tsx b/frontend/src/App/ApplyTheme.tsx
new file mode 100644
index 000000000..cdd430541
--- /dev/null
+++ b/frontend/src/App/ApplyTheme.tsx
@@ -0,0 +1,37 @@
+import React, { Fragment, ReactNode, useCallback, useEffect } from 'react';
+import { useSelector } from 'react-redux';
+import { createSelector } from 'reselect';
+import themes from 'Styles/Themes';
+import AppState from './State/AppState';
+
+interface ApplyThemeProps {
+  children: ReactNode;
+}
+
+function createThemeSelector() {
+  return createSelector(
+    (state: AppState) => state.settings.ui.item.theme || window.Radarr.theme,
+    (theme) => {
+      return theme;
+    }
+  );
+}
+
+function ApplyTheme({ children }: ApplyThemeProps) {
+  const theme = useSelector(createThemeSelector());
+
+  const updateCSSVariables = useCallback(() => {
+    Object.entries(themes[theme]).forEach(([key, value]) => {
+      document.documentElement.style.setProperty(`--${key}`, value);
+    });
+  }, [theme]);
+
+  // On Component Mount and Component Update
+  useEffect(() => {
+    updateCSSVariables();
+  }, [updateCSSVariables, theme]);
+
+  return <Fragment>{children}</Fragment>;
+}
+
+export default ApplyTheme;
diff --git a/frontend/src/Styles/Themes/index.js b/frontend/src/Styles/Themes/index.js
index d93c5dd8c..4dec39164 100644
--- a/frontend/src/Styles/Themes/index.js
+++ b/frontend/src/Styles/Themes/index.js
@@ -2,7 +2,7 @@ import * as dark from './dark';
 import * as light from './light';
 
 const defaultDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
-const auto = defaultDark ? { ...dark } : { ...light };
+const auto = defaultDark ? dark : light;
 
 export default {
   auto,
diff --git a/frontend/src/login.html b/frontend/src/login.html
index 4ba94c956..d1a480719 100644
--- a/frontend/src/login.html
+++ b/frontend/src/login.html
@@ -57,8 +57,8 @@
 
     <style>
       body {
-        background-color: #f5f7fa;
-        color: #656565;
+        background-color: var(--pageBackground);
+        color: var(--textColor);
         font-family: "Roboto", "open sans", "Helvetica Neue", Helvetica, Arial,
           sans-serif;
       }
@@ -88,14 +88,14 @@
         padding: 10px;
         border-top-left-radius: 4px;
         border-top-right-radius: 4px;
-        background-color: #464b51;
+        background-color: var(--themeDarkColor);
       }
 
       .panel-body {
         padding: 20px;
         border-bottom-right-radius: 4px;
         border-bottom-left-radius: 4px;
-        background-color: #fff;
+        background-color: var(--panelBackground);
       }
 
       .sign-in {
@@ -112,16 +112,17 @@
         padding: 6px 16px;
         width: 100%;
         height: 35px;
-        border: 1px solid #dde6e9;
+        background-color: var(--inputBackgroundColor);
+        border: 1px solid var(--inputBorderColor);
         border-radius: 4px;
-        box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
+        box-shadow: inset 0 1px 1px var(--inputBoxShadowColor);
       }
 
       .form-input:focus {
         outline: 0;
-        border-color: #66afe9;
-        box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
-          0 0 8px rgba(102, 175, 233, 0.6);
+        border-color: var(--inputFocusBorderColor);
+        box-shadow: inset 0 1px 1px var(--inputBoxShadowColor),
+          0 0 8px var(--inputFocusBoxShadowColor);
       }
 
       .button {
@@ -130,10 +131,10 @@
         padding: 10px 0;
         width: 100%;
         border: 1px solid;
-        border-color: #5899eb;
+        border-color: var(--primaryBorderColor);
         border-radius: 4px;
-        background-color: #5d9cec;
-        color: #fff;
+        background-color: var(--primaryBackgroundColor);
+        color: var(--white);
         vertical-align: middle;
         text-align: center;
         white-space: nowrap;
@@ -141,9 +142,9 @@
       }
 
       .button:hover {
-        border-color: #3483e7;
-        background-color: #4b91ea;
-        color: #fff;
+        border-color: var(--primaryHoverBorderColor);
+        background-color: var(--primaryHoverBackgroundColor);
+        color: var(--white);
         text-decoration: none;
       }
 
@@ -165,24 +166,24 @@
 
       .forgot-password {
         margin-left: auto;
-        color: #909fa7;
+        color: var(--forgotPasswordColor);
         text-decoration: none;
         font-size: 13px;
       }
 
       .forgot-password:focus,
       .forgot-password:hover {
-        color: #748690;
+        color: var(--forgotPasswordAltColor);
         text-decoration: underline;
       }
 
       .forgot-password:visited {
-        color: #748690;
+        color: var(--forgotPasswordAltColor);
       }
 
       .login-failed {
         margin-top: 20px;
-        color: #f05050;
+        color: var(--failedColor);
         font-size: 14px;
       }
 
@@ -291,5 +292,59 @@
 
       loginFailedDiv.classList.remove("hidden");
     }
+
+    var light = {
+      white: '#fff',
+      pageBackground: '#f5f7fa',
+      textColor: '#656565',
+      themeDarkColor: '#464b51',
+      panelBackground: '#fff',
+      inputBackgroundColor: '#fff',
+      inputBorderColor: '#dde6e9',
+      inputBoxShadowColor: 'rgba(0, 0, 0, 0.075)',
+      inputFocusBorderColor: '#66afe9',
+      inputFocusBoxShadowColor: 'rgba(102, 175, 233, 0.6)',
+      primaryBackgroundColor: '#5d9cec',
+      primaryBorderColor: '#5899eb',
+      primaryHoverBackgroundColor: '#4b91ea',
+      primaryHoverBorderColor: '#3483e7',
+      failedColor: '#f05050',
+      forgotPasswordColor: '#909fa7',
+      forgotPasswordAltColor: '#748690'
+    };
+
+    var dark = {
+      white: '#fff',
+      pageBackground: '#202020',
+      textColor: '#656565',
+      themeDarkColor: '#494949',
+      panelBackground: '#111',
+      inputBackgroundColor: '#333',
+      inputBorderColor: '#dde6e9',
+      inputBoxShadowColor: 'rgba(0, 0, 0, 0.075)',
+      inputFocusBorderColor: '#66afe9',
+      inputFocusBoxShadowColor: 'rgba(102, 175, 233, 0.6)',
+      primaryBackgroundColor: '#5d9cec',
+      primaryBorderColor: '#5899eb',
+      primaryHoverBackgroundColor: '#4b91ea',
+      primaryHoverBorderColor: '#3483e7',
+      failedColor: '#f05050',
+      forgotPasswordColor: '#737d83',
+      forgotPasswordAltColor: '#546067'
+    };
+
+    var theme = "_THEME_";
+    var defaultDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+    var finalTheme = theme === 'dark' || (theme === 'auto' && defaultDark) ?
+      dark :
+      light;
+
+    Object.entries(finalTheme).forEach(([key, value]) => {
+      document.documentElement.style.setProperty(
+        `--${key}`,
+        value
+      );
+    });
+
   </script>
 </html>
diff --git a/frontend/src/typings/UiSettings.ts b/frontend/src/typings/UiSettings.ts
index 337bfbe5b..7c642cbd0 100644
--- a/frontend/src/typings/UiSettings.ts
+++ b/frontend/src/typings/UiSettings.ts
@@ -1,5 +1,5 @@
 export interface UiSettings {
-  theme: string;
+  theme: 'auto' | 'dark' | 'light';
   showRelativeDates: boolean;
   shortDateFormat: string;
   longDateFormat: string;
diff --git a/src/Radarr.Http/Frontend/Mappers/HtmlMapperBase.cs b/src/Radarr.Http/Frontend/Mappers/HtmlMapperBase.cs
index fd37bbbed..0e2e0bf43 100644
--- a/src/Radarr.Http/Frontend/Mappers/HtmlMapperBase.cs
+++ b/src/Radarr.Http/Frontend/Mappers/HtmlMapperBase.cs
@@ -39,7 +39,7 @@ namespace Radarr.Http.Frontend.Mappers
             return stream;
         }
 
-        protected string GetHtmlText()
+        protected virtual string GetHtmlText()
         {
             if (RuntimeInfo.IsProduction && _generatedContent != null)
             {
diff --git a/src/Radarr.Http/Frontend/Mappers/LoginHtmlMapper.cs b/src/Radarr.Http/Frontend/Mappers/LoginHtmlMapper.cs
index 184c826cf..43956941a 100644
--- a/src/Radarr.Http/Frontend/Mappers/LoginHtmlMapper.cs
+++ b/src/Radarr.Http/Frontend/Mappers/LoginHtmlMapper.cs
@@ -9,6 +9,8 @@ namespace Radarr.Http.Frontend.Mappers
 {
     public class LoginHtmlMapper : HtmlMapperBase
     {
+        private readonly IConfigFileProvider _configFileProvider;
+
         public LoginHtmlMapper(IAppFolderInfo appFolderInfo,
                                IDiskProvider diskProvider,
                                Lazy<ICacheBreakerProvider> cacheBreakProviderFactory,
@@ -16,6 +18,7 @@ namespace Radarr.Http.Frontend.Mappers
                                Logger logger)
             : base(diskProvider, cacheBreakProviderFactory, logger)
         {
+            _configFileProvider = configFileProvider;
             HtmlPath = Path.Combine(appFolderInfo.StartUpFolder, configFileProvider.UiFolder, "login.html");
             UrlBase = configFileProvider.UrlBase;
         }
@@ -29,5 +32,15 @@ namespace Radarr.Http.Frontend.Mappers
         {
             return resourceUrl.StartsWith("/login");
         }
+
+        protected override string GetHtmlText()
+        {
+            var html = base.GetHtmlText();
+            var theme = _configFileProvider.Theme;
+
+            html = html.Replace("_THEME_", theme);
+
+            return html;
+        }
     }
 }