diff --git a/src/citron/CMakeLists.txt b/src/citron/CMakeLists.txt
index 2feb192e2..d2ae1286b 100644
--- a/src/citron/CMakeLists.txt
+++ b/src/citron/CMakeLists.txt
@@ -233,6 +233,8 @@ add_executable(citron
     util/performance_overlay.h
     util/multiplayer_room_overlay.cpp
     util/multiplayer_room_overlay.h
+    util/rainbow_style.cpp
+    util/rainbow_style.h
     util/vram_overlay.cpp
     util/vram_overlay.h
     util/sequence_dialog/sequence_dialog.cpp
@@ -455,7 +457,7 @@ endif()
 
 target_link_libraries(citron PRIVATE Vulkan::Headers)
 if (NOT WIN32)
-    target_include_directories(citron PRIVATE ${Qt6Gui_PRIVATE_INCLUDE_DIRS})
+    target_link_libraries(citron PRIVATE Qt6::GuiPrivate)
 endif()
 if (UNIX AND NOT APPLE)
     target_link_libraries(citron PRIVATE Qt6::DBus)
diff --git a/src/citron/configuration/configure_dialog.cpp b/src/citron/configuration/configure_dialog.cpp
index ff656fc72..6cff3c14e 100644
--- a/src/citron/configuration/configure_dialog.cpp
+++ b/src/citron/configuration/configure_dialog.cpp
@@ -44,6 +44,7 @@
 #include "citron/configuration/configure_ui.h"
 #include "citron/configuration/configure_web.h"
 #include "citron/configuration/style_animation_event_filter.h"
+#include "citron/util/rainbow_style.h"
 #include "citron/game_list.h"
 #include "citron/hotkeys.h"
 #include "citron/main.h"
@@ -99,7 +100,7 @@ ConfigureDialog::ConfigureDialog(QWidget* parent, HotkeyRegistry& registry_,
       network_tab{std::make_unique<ConfigureNetwork>(system_, this)},
       profile_tab{std::make_unique<ConfigureProfileManager>(system_, this)},
       system_tab{std::make_unique<ConfigureSystem>(system_, nullptr, *builder, this)},
-      web_tab{std::make_unique<ConfigureWeb>(this)}, rainbow_timer{new QTimer(this)} {
+      web_tab{std::make_unique<ConfigureWeb>(this)} {
 
     if (auto* main_window = qobject_cast<GMainWindow*>(parent)) {
         connect(filesystem_tab.get(), &ConfigureFilesystem::RequestGameListRefresh,
@@ -169,7 +170,6 @@ ConfigureDialog::ConfigureDialog(QWidget* parent, HotkeyRegistry& registry_,
     connect(tab_button_group.get(), qOverload<int>(&QButtonGroup::idClicked), this, &ConfigureDialog::AnimateTabSwitch);
     connect(ui_tab.get(), &ConfigureUi::themeChanged, this, &ConfigureDialog::UpdateTheme);
     connect(ui_tab.get(), &ConfigureUi::UIPositioningChanged, this, &ConfigureDialog::SetUIPositioning);
-    connect(rainbow_timer, &QTimer::timeout, this, &ConfigureDialog::UpdateTheme);
     web_tab->SetWebServiceConfigEnabled(enable_web_config);
     hotkeys_tab->Populate(registry);
     input_tab->Initialize(input_subsystem);
@@ -192,51 +192,70 @@ ConfigureDialog::~ConfigureDialog() {
 }
 
 void ConfigureDialog::UpdateTheme() {
-    QString accent_color_str;
-    if (UISettings::values.enable_rainbow_mode.GetValue()) {
-        rainbow_hue += 0.003f;
-        if (rainbow_hue > 1.0f) rainbow_hue = 0.0f;
-        QColor accent_color = QColor::fromHsvF(rainbow_hue, 0.8f, 1.0f);
-        accent_color_str = accent_color.name(QColor::HexRgb);
-        if (!rainbow_timer->isActive()) rainbow_timer->start(150);
-    } else {
-        if (rainbow_timer->isActive()) rainbow_timer->stop();
-        accent_color_str = Theme::GetAccentColor();
-    }
-    QColor accent_color(accent_color_str);
-    const QString accent_color_hover = accent_color.lighter(115).name(QColor::HexRgb);
-    const QString accent_color_pressed = accent_color.darker(120).name(QColor::HexRgb);
+    const bool is_rainbow = UISettings::values.enable_rainbow_mode.GetValue();
+    const QString accent = Theme::GetAccentColor();
     const bool is_dark = IsDarkMode();
-    const QString bg_color = is_dark ? QStringLiteral("#2b2b2b") : QStringLiteral("#ffffff");
-    const QString text_color = is_dark ? QStringLiteral("#ffffff") : QStringLiteral("#000000");
-    const QString secondary_bg_color = is_dark ? QStringLiteral("#3d3d3d") : QStringLiteral("#f0f0f0");
-    const QString tertiary_bg_color = is_dark ? QStringLiteral("#5d5d5d") : QStringLiteral("#d3d3d3");
-    const QString button_bg_color = is_dark ? QStringLiteral("#383838") : QStringLiteral("#e1e1e1");
-    const QString hover_bg_color = is_dark ? QStringLiteral("#4d4d4d") : QStringLiteral("#e8f0fe");
-    const QString focus_bg_color = is_dark ? QStringLiteral("#404040") : QStringLiteral("#e8f0fe");
-    const QString disabled_text_color = is_dark ? QStringLiteral("#8d8d8d") : QStringLiteral("#a0a0a0");
-    static QString cached_template_style_sheet;
-    if (cached_template_style_sheet.isEmpty()) {
-        cached_template_style_sheet = property("templateStyleSheet").toString();
-    }
-    QString style_sheet = cached_template_style_sheet;
-    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR%%"), accent_color_str);
-    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR_HOVER%%"), accent_color_hover);
-    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR_PRESSED%%"), accent_color_pressed);
-    style_sheet.replace(QStringLiteral("%%BACKGROUND_COLOR%%"), bg_color);
-    style_sheet.replace(QStringLiteral("%%TEXT_COLOR%%"), text_color);
-    style_sheet.replace(QStringLiteral("%%SECONDARY_BG_COLOR%%"), secondary_bg_color);
-    style_sheet.replace(QStringLiteral("%%TERTIARY_BG_COLOR%%"), tertiary_bg_color);
-    style_sheet.replace(QStringLiteral("%%BUTTON_BG_COLOR%%"), button_bg_color);
-    style_sheet.replace(QStringLiteral("%%HOVER_BG_COLOR%%"), hover_bg_color);
-    style_sheet.replace(QStringLiteral("%%FOCUS_BG_COLOR%%"), focus_bg_color);
-    style_sheet.replace(QStringLiteral("%%DISABLED_TEXT_COLOR%%"), disabled_text_color);
+
+    const QString bg = is_dark ? QStringLiteral("#2b2b2b") : QStringLiteral("#ffffff");
+    const QString txt = is_dark ? QStringLiteral("#ffffff") : QStringLiteral("#000000");
+    const QString sec = is_dark ? QStringLiteral("#3d3d3d") : QStringLiteral("#f0f0f0");
+    const QString ter = is_dark ? QStringLiteral("#5d5d5d") : QStringLiteral("#d3d3d3");
+    const QString b_bg = is_dark ? QStringLiteral("#383838") : QStringLiteral("#e1e1e1");
+    const QString h_bg = is_dark ? QStringLiteral("#4d4d4d") : QStringLiteral("#e8f0fe");
+    const QString f_bg = is_dark ? QStringLiteral("#404040") : QStringLiteral("#e8f0fe");
+    const QString d_txt = is_dark ? QStringLiteral("#8d8d8d") : QStringLiteral("#a0a0a0");
+
+    static QString cached_template;
+    if (cached_template.isEmpty()) cached_template = property("templateStyleSheet").toString();
+    QString style_sheet = cached_template;
+
+    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR%%"), accent);
+    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR_HOVER%%"), Theme::GetAccentColorHover());
+    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR_PRESSED%%"), Theme::GetAccentColorPressed());
+    style_sheet.replace(QStringLiteral("%%BACKGROUND_COLOR%%"), bg);
+    style_sheet.replace(QStringLiteral("%%TEXT_COLOR%%"), txt);
+    style_sheet.replace(QStringLiteral("%%SECONDARY_BG_COLOR%%"), sec);
+    style_sheet.replace(QStringLiteral("%%TERTIARY_BG_COLOR%%"), ter);
+    style_sheet.replace(QStringLiteral("%%BUTTON_BG_COLOR%%"), b_bg);
+    style_sheet.replace(QStringLiteral("%%HOVER_BG_COLOR%%"), h_bg);
+    style_sheet.replace(QStringLiteral("%%FOCUS_BG_COLOR%%"), f_bg);
+    style_sheet.replace(QStringLiteral("%%DISABLED_TEXT_COLOR%%"), d_txt);
+
+    style_sheet += QStringLiteral(
+        "QSlider::handle:horizontal { background-color: %1; }"
+        "QCheckBox::indicator:checked { background-color: %1; border-color: %1; }"
+    ).arg(accent);
+
     setStyleSheet(style_sheet);
+
     graphics_tab->SetTemplateStyleSheet(style_sheet);
     system_tab->SetTemplateStyleSheet(style_sheet);
     audio_tab->SetTemplateStyleSheet(style_sheet);
     cpu_tab->SetTemplateStyleSheet(style_sheet);
     graphics_advanced_tab->SetTemplateStyleSheet(style_sheet);
+
+    if (is_rainbow) {
+        if (!rainbow_timer) {
+            rainbow_timer = new QTimer(this);
+            connect(rainbow_timer, &QTimer::timeout, this, [this] {
+                QString hue_hex = RainbowStyle::GetCurrentHighlightColor().name();
+                QString sidebar_css = QStringLiteral(
+                    "QPushButton.tabButton { border: 2px solid transparent; }"
+                    "QPushButton.tabButton:checked { color: %1; border: 2px solid %1; }"
+                    "QPushButton.tabButton:hover { border: 2px solid %1; }"
+                    "QPushButton.tabButton:pressed { background-color: %1; color: #ffffff; }"
+                ).arg(hue_hex);
+
+                if (ui->topButtonWidget) ui->topButtonWidget->setStyleSheet(sidebar_css);
+                if (ui->horizontalNavWidget) ui->horizontalNavWidget->setStyleSheet(sidebar_css);
+            });
+        }
+        rainbow_timer->start(33);
+    } else if (rainbow_timer) {
+        rainbow_timer->stop();
+        if (ui->topButtonWidget) ui->topButtonWidget->setStyleSheet({});
+        if (ui->horizontalNavWidget) ui->horizontalNavWidget->setStyleSheet({});
+    }
 }
 
 void ConfigureDialog::SetUIPositioning(const QString& positioning) {
diff --git a/src/citron/configuration/configure_dialog.h b/src/citron/configuration/configure_dialog.h
index 89f0b8bbb..a5cde5c00 100644
--- a/src/citron/configuration/configure_dialog.h
+++ b/src/citron/configuration/configure_dialog.h
@@ -91,6 +91,5 @@ private:
     std::unique_ptr<ConfigureWeb> web_tab;
     std::unique_ptr<QButtonGroup> tab_button_group;
     std::vector<QPushButton*> tab_buttons;
-    QTimer* rainbow_timer;
-    float rainbow_hue = 0.0f;
+    QTimer* rainbow_timer{nullptr};
 };
diff --git a/src/citron/configuration/configure_per_game.cpp b/src/citron/configuration/configure_per_game.cpp
index 9eb2324ad..2f0ad8d6d 100644
--- a/src/citron/configuration/configure_per_game.cpp
+++ b/src/citron/configuration/configure_per_game.cpp
@@ -63,6 +63,7 @@
 #include "citron/configuration/configure_per_game_addons.h"
 #include "citron/configuration/configure_per_game_cheats.h"
 #include "citron/configuration/configure_system.h"
+#include "citron/util/rainbow_style.h"
 #include "citron/theme.h"
 #include "citron/uisettings.h"
 #include "citron/util/util.h"
@@ -100,8 +101,7 @@ ConfigurePerGame::ConfigurePerGame(QWidget* parent, u64 title_id_, const std::st
     : QDialog(parent), ui(std::make_unique<Ui::ConfigurePerGame>()), title_id{title_id_},
       file_name{file_name_}, system{system_},
       builder{std::make_unique<ConfigurationShared::Builder>(this, !system_.IsPoweredOn())},
-      tab_group{std::make_shared<std::vector<ConfigurationShared::Tab*>>()},
-      rainbow_timer{new QTimer(this)} {
+      tab_group{std::make_shared<std::vector<ConfigurationShared::Tab*>>() } {
 
     ui->setupUi(this);
 
@@ -131,7 +131,6 @@ ConfigurePerGame::ConfigurePerGame(QWidget* parent, u64 title_id_, const std::st
     }
 
     UpdateTheme();
-    connect(rainbow_timer, &QTimer::timeout, this, &ConfigurePerGame::UpdateTheme);
 
     auto* animation_filter = new StyleAnimationEventFilter(this);
 
@@ -256,68 +255,69 @@ void ConfigurePerGame::LoadFromFile(FileSys::VirtualFile file_) {
 }
 
 void ConfigurePerGame::UpdateTheme() {
-    QString accent_color_str;
-    if (UISettings::values.enable_rainbow_mode.GetValue()) {
-        rainbow_hue += 0.003f;
-        if (rainbow_hue > 1.0f) {
-            rainbow_hue = 0.0f;
-        }
-        QColor accent_color = QColor::fromHsvF(rainbow_hue, 0.8f, 1.0f);
-        accent_color_str = accent_color.name(QColor::HexRgb);
-        if (!rainbow_timer->isActive()) {
-            rainbow_timer->start(150);
-        }
-    } else {
-        if (rainbow_timer->isActive()) {
-            rainbow_timer->stop();
-        }
-        accent_color_str = Theme::GetAccentColor();
-    }
-
-    QColor accent_color(accent_color_str);
-    const QString accent_color_hover = accent_color.lighter(115).name(QColor::HexRgb);
-    const QString accent_color_pressed = accent_color.darker(120).name(QColor::HexRgb);
-
+    const bool is_rainbow = UISettings::values.enable_rainbow_mode.GetValue();
+    const QString accent = Theme::GetAccentColor();
     const bool is_dark = IsDarkMode();
-    const QString bg_color = is_dark ? QStringLiteral("#2b2b2b") : QStringLiteral("#ffffff");
-    const QString text_color = is_dark ? QStringLiteral("#ffffff") : QStringLiteral("#000000");
-    const QString secondary_bg_color = is_dark ? QStringLiteral("#3d3d3d") : QStringLiteral("#f0f0f0");
-    const QString tertiary_bg_color = is_dark ? QStringLiteral("#5d5d5d") : QStringLiteral("#d3d3d3");
-    const QString button_bg_color = is_dark ? QStringLiteral("#383838") : QStringLiteral("#e1e1e1");
-    const QString hover_bg_color = is_dark ? QStringLiteral("#4d4d4d") : QStringLiteral("#e8f0fe");
-    const QString focus_bg_color = is_dark ? QStringLiteral("#404040") : QStringLiteral("#e8f0fe");
-    const QString disabled_text_color = is_dark ? QStringLiteral("#8d8d8d") : QStringLiteral("#a0a0a0");
 
-    static QString cached_template_style_sheet;
-    if (cached_template_style_sheet.isEmpty()) {
-        cached_template_style_sheet = property("templateStyleSheet").toString();
-    }
+    const QString bg = is_dark ? QStringLiteral("#2b2b2b") : QStringLiteral("#ffffff");
+    const QString txt = is_dark ? QStringLiteral("#ffffff") : QStringLiteral("#000000");
+    const QString sec = is_dark ? QStringLiteral("#3d3d3d") : QStringLiteral("#f0f0f0");
+    const QString ter = is_dark ? QStringLiteral("#5d5d5d") : QStringLiteral("#d3d3d3");
+    const QString b_bg = is_dark ? QStringLiteral("#383838") : QStringLiteral("#e1e1e1");
+    const QString h_bg = is_dark ? QStringLiteral("#4d4d4d") : QStringLiteral("#e8f0fe");
+    const QString f_bg = is_dark ? QStringLiteral("#404040") : QStringLiteral("#e8f0fe");
+    const QString d_txt = is_dark ? QStringLiteral("#8d8d8d") : QStringLiteral("#a0a0a0");
 
-    QString style_sheet = cached_template_style_sheet;
+    static QString cached_template;
+    if (cached_template.isEmpty()) cached_template = property("templateStyleSheet").toString();
+    QString style_sheet = cached_template;
 
-    // Replace accent colors (existing logic)
-    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR%%"), accent_color_str);
-    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR_HOVER%%"), accent_color_hover);
-    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR_PRESSED%%"), accent_color_pressed);
+    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR%%"), accent);
+    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR_HOVER%%"), Theme::GetAccentColorHover());
+    style_sheet.replace(QStringLiteral("%%ACCENT_COLOR_PRESSED%%"), Theme::GetAccentColorPressed());
+    style_sheet.replace(QStringLiteral("%%BACKGROUND_COLOR%%"), bg);
+    style_sheet.replace(QStringLiteral("%%TEXT_COLOR%%"), txt);
+    style_sheet.replace(QStringLiteral("%%SECONDARY_BG_COLOR%%"), sec);
+    style_sheet.replace(QStringLiteral("%%TERTIARY_BG_COLOR%%"), ter);
+    style_sheet.replace(QStringLiteral("%%BUTTON_BG_COLOR%%"), b_bg);
+    style_sheet.replace(QStringLiteral("%%HOVER_BG_COLOR%%"), h_bg);
+    style_sheet.replace(QStringLiteral("%%FOCUS_BG_COLOR%%"), f_bg);
+    style_sheet.replace(QStringLiteral("%%DISABLED_TEXT_COLOR%%"), d_txt);
 
-    // Replace base theme colors (new logic)
-    style_sheet.replace(QStringLiteral("%%BACKGROUND_COLOR%%"), bg_color);
-    style_sheet.replace(QStringLiteral("%%TEXT_COLOR%%"), text_color);
-    style_sheet.replace(QStringLiteral("%%SECONDARY_BG_COLOR%%"), secondary_bg_color);
-    style_sheet.replace(QStringLiteral("%%TERTIARY_BG_COLOR%%"), tertiary_bg_color);
-    style_sheet.replace(QStringLiteral("%%BUTTON_BG_COLOR%%"), button_bg_color);
-    style_sheet.replace(QStringLiteral("%%HOVER_BG_COLOR%%"), hover_bg_color);
-    style_sheet.replace(QStringLiteral("%%FOCUS_BG_COLOR%%"), focus_bg_color);
-    style_sheet.replace(QStringLiteral("%%DISABLED_TEXT_COLOR%%"), disabled_text_color);
+    style_sheet += QStringLiteral(
+        "QSlider::handle:horizontal { background-color: %1; }"
+        "QCheckBox::indicator:checked { background-color: %1; border-color: %1; }"
+        "QToolButton { background-color: %1; color: #ffffff; border-radius: 4px; }"
+    ).arg(accent);
 
     setStyleSheet(style_sheet);
 
-    // This part is crucial to pass the theme to child tabs
     graphics_tab->SetTemplateStyleSheet(style_sheet);
     system_tab->SetTemplateStyleSheet(style_sheet);
     audio_tab->SetTemplateStyleSheet(style_sheet);
     cpu_tab->SetTemplateStyleSheet(style_sheet);
     graphics_advanced_tab->SetTemplateStyleSheet(style_sheet);
+
+    if (is_rainbow) {
+        if (!rainbow_timer) {
+            rainbow_timer = new QTimer(this);
+            connect(rainbow_timer, &QTimer::timeout, this, [this] {
+                QString hue_hex = RainbowStyle::GetCurrentHighlightColor().name();
+                QString button_css = QStringLiteral(
+                    "QPushButton#aestheticTabButton { border: 2px solid transparent; }"
+                    "QPushButton#aestheticTabButton:checked { color: %1; border: 2px solid %1; }"
+                    "QPushButton#aestheticTabButton:hover { border: 2px solid %1; }"
+                    "QPushButton#aestheticTabButton:pressed { background-color: %1; color: #ffffff; }"
+                ).arg(hue_hex);
+
+                if (ui->tabButtonsContainer) ui->tabButtonsContainer->setStyleSheet(button_css);
+            });
+        }
+        rainbow_timer->start(33);
+    } else if (rainbow_timer) {
+        rainbow_timer->stop();
+        if (ui->tabButtonsContainer) ui->tabButtonsContainer->setStyleSheet({});
+    }
 }
 
 void ConfigurePerGame::LoadConfiguration() {
diff --git a/src/citron/configuration/configure_per_game.h b/src/citron/configuration/configure_per_game.h
index b40d64a3e..8c6b82b75 100644
--- a/src/citron/configuration/configure_per_game.h
+++ b/src/citron/configuration/configure_per_game.h
@@ -100,9 +100,7 @@ private:
     std::unique_ptr<ConfigureInputPerGame> input_tab;
     std::unique_ptr<ConfigureLinuxTab> linux_tab;
     std::unique_ptr<ConfigureSystem> system_tab;
-
-    QTimer* rainbow_timer;
-    float rainbow_hue = 0.0f;
+    QTimer* rainbow_timer{nullptr};
 
     QButtonGroup* button_group;
     QPixmap map;
diff --git a/src/citron/configuration/configure_ui.ui b/src/citron/configuration/configure_ui.ui
index e3e2bbdef..081ea5313 100644
--- a/src/citron/configuration/configure_ui.ui
+++ b/src/citron/configuration/configure_ui.ui
@@ -140,7 +140,7 @@
                                 <item row="4" column="1">
                                     <widget class="QCheckBox" name="rainbowModeCheckBox">
                                         <property name="text">
-                                            <string>Enable Rainbow Mode</string>
+                                            <string>Enable Rainbow Tab Buttons</string>
                                         </property>
                                     </widget>
                                 </item>
diff --git a/src/citron/main.cpp b/src/citron/main.cpp
index e1458fe59..b7d90338b 100644
--- a/src/citron/main.cpp
+++ b/src/citron/main.cpp
@@ -178,6 +178,7 @@ static FileSys::VirtualFile VfsDirectoryCreateFileWrapper(const FileSys::Virtual
 #include "citron/main.h"
 #include "citron/play_time_manager.h"
 #include "citron/startup_checks.h"
+#include "citron/util/rainbow_style.h"
 #include "citron/uisettings.h"
 #ifdef CITRON_USE_AUTO_UPDATER
 #include "citron/updater/updater_dialog.h"
@@ -6209,7 +6210,9 @@ int main(int argc, char* argv[]) {
     setlocale(LC_ALL, "C");
 
     GMainWindow main_window{std::move(config), has_broken_vulkan};
-    // After settings have been loaded by GMainWindow, apply the filter
+
+    app.setStyle(new RainbowStyle(app.style()));
+
     main_window.show();
 
     QObject::connect(&app, &QGuiApplication::applicationStateChanged, &main_window,
diff --git a/src/citron/util/rainbow_style.cpp b/src/citron/util/rainbow_style.cpp
new file mode 100644
index 000000000..fe3adef5c
--- /dev/null
+++ b/src/citron/util/rainbow_style.cpp
@@ -0,0 +1,38 @@
+// SPDX-FileCopyrightText: 2025 citron Emulator Project
+
+#include "citron/util/rainbow_style.h"
+#include "citron/uisettings.h"
+#include "citron/theme.h"
+#include <QApplication>
+#include <QPalette>
+#include <QWidget>
+
+float RainbowStyle::s_hue = 0.0f;
+
+RainbowStyle::RainbowStyle(QStyle* baseStyle) : QProxyStyle(baseStyle) {
+    m_timer = new QTimer(this);
+    connect(m_timer, &QTimer::timeout, this, &RainbowStyle::UpdateHue);
+    m_timer->start(33);
+}
+
+void RainbowStyle::UpdateHue() {
+	if (UISettings::values.enable_rainbow_mode.GetValue()) {
+		s_hue += 0.005f;
+		if (s_hue > 1.0f) s_hue = 0.0f;
+	}
+}
+
+QColor RainbowStyle::GetCurrentHighlightColor() {
+    if (!UISettings::values.enable_rainbow_mode.GetValue()) {
+        return QColor(Theme::GetAccentColor());
+    }
+    return QColor::fromHsvF(s_hue, 0.7f, 1.0f);
+}
+
+QPalette RainbowStyle::standardPalette() const {
+    QPalette pal = QProxyStyle::standardPalette();
+    QColor highlight = GetCurrentHighlightColor();
+    pal.setColor(QPalette::Highlight, highlight);
+    pal.setColor(QPalette::Link, highlight);
+    return pal;
+}
diff --git a/src/citron/util/rainbow_style.h b/src/citron/util/rainbow_style.h
new file mode 100644
index 000000000..f45fde2aa
--- /dev/null
+++ b/src/citron/util/rainbow_style.h
@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: 2025 citron Emulator Project
+
+#pragma once
+
+#include <QProxyStyle>
+#include <QTimer>
+#include <QColor>
+
+class RainbowStyle : public QProxyStyle {
+    Q_OBJECT
+
+public:
+    explicit RainbowStyle(QStyle* baseStyle = nullptr);
+
+    // This intercepts palette requests from every widget in the app
+    QPalette standardPalette() const override;
+
+    // A helper for widgets that need the color directly
+    static QColor GetCurrentHighlightColor();
+
+private slots:
+    void UpdateHue();
+
+private:
+    QTimer* m_timer;
+    static float s_hue;
+};