diff --git a/Userland/Applications/SystemMonitor/GraphWidget.cpp b/Userland/Applications/SystemMonitor/GraphWidget.cpp
index 5c1d9982d4..3452ece2d5 100644
--- a/Userland/Applications/SystemMonitor/GraphWidget.cpp
+++ b/Userland/Applications/SystemMonitor/GraphWidget.cpp
@@ -27,7 +27,9 @@
 #include "GraphWidget.h"
 #include <LibGUI/Painter.h>
 #include <LibGfx/Font.h>
+#include <LibGfx/Palette.h>
 #include <LibGfx/Path.h>
+#include <LibGfx/SystemTheme.h>
 
 GraphWidget::GraphWidget()
 {
@@ -49,7 +51,7 @@ void GraphWidget::paint_event(GUI::PaintEvent& event)
     GUI::Painter painter(*this);
     painter.add_clip_rect(event.rect());
     painter.add_clip_rect(frame_inner_rect());
-    painter.fill_rect(event.rect(), m_background_color);
+    painter.fill_rect(event.rect(), palette().base());
 
     auto inner_rect = frame_inner_rect();
     float scale = (float)inner_rect.height() / (float)m_max;
diff --git a/Userland/Applications/SystemMonitor/GraphWidget.h b/Userland/Applications/SystemMonitor/GraphWidget.h
index fc40f59bbd..67fd453efe 100644
--- a/Userland/Applications/SystemMonitor/GraphWidget.h
+++ b/Userland/Applications/SystemMonitor/GraphWidget.h
@@ -39,8 +39,6 @@ public:
 
     void add_value(Vector<int, 1>&&);
 
-    void set_background_color(Color color) { m_background_color = color; }
-
     struct ValueFormat {
         Color line_color { Color::Transparent };
         Color background_color { Color::Transparent };
@@ -63,7 +61,6 @@ private:
     int m_max { 100 };
     Vector<ValueFormat, 1> m_value_format;
     CircularQueue<Vector<int, 1>, 4000> m_values;
-    Color m_background_color { Color::Black };
     bool m_stack_values { false };
 
     Vector<Gfx::IntPoint, 1> m_calculated_points;
diff --git a/Userland/Applications/SystemMonitor/main.cpp b/Userland/Applications/SystemMonitor/main.cpp
index c845b0c92b..50e5fd9363 100644
--- a/Userland/Applications/SystemMonitor/main.cpp
+++ b/Userland/Applications/SystemMonitor/main.cpp
@@ -573,6 +573,8 @@ NonnullRefPtr<GUI::Widget> build_graphs_tab()
     auto graphs_container = GUI::LazyWidget::construct();
 
     graphs_container->on_first_show = [](GUI::LazyWidget& self) {
+        const auto system_palette = GUI::Application::the()->palette();
+
         self.set_fill_with_background_color(true);
         self.set_background_role(ColorRole::Button);
         self.set_layout<GUI::VerticalBoxLayout>();
@@ -586,17 +588,14 @@ NonnullRefPtr<GUI::Widget> build_graphs_tab()
         for (size_t i = 0; i < ProcessModel::the().cpus().size(); i++) {
             auto& cpu_graph = cpu_graph_group_box.add<GraphWidget>();
             cpu_graph.set_max(100);
-            cpu_graph.set_background_color(Color::White);
             cpu_graph.set_value_format(0, {
-                                              .line_color = Color::Blue,
-                                              .background_color = Color::from_rgb(0xaaaaff),
+                                              .line_color = system_palette.syntax_preprocessor_statement(),
                                               .text_formatter = [](int value) {
                                                   return String::formatted("Total: {}%", value);
                                               },
                                           });
             cpu_graph.set_value_format(1, {
-                                              .line_color = Color::Red,
-                                              .background_color = Color::from_rgb(0xffaaaa),
+                                              .line_color = system_palette.syntax_preprocessor_value(),
                                               .text_formatter = [](int value) {
                                                   return String::formatted("Kernel: {}%", value);
                                               },
@@ -613,25 +612,21 @@ NonnullRefPtr<GUI::Widget> build_graphs_tab()
         memory_graph_group_box.layout()->set_margins({ 6, 16, 6, 6 });
         memory_graph_group_box.set_fixed_height(120);
         auto& memory_graph = memory_graph_group_box.add<GraphWidget>();
-        memory_graph.set_background_color(Color::White);
         memory_graph.set_stack_values(true);
         memory_graph.set_value_format(0, {
-                                             .line_color = Color::from_rgb(0x619910),
-                                             .background_color = Color::from_rgb(0xbbffbb),
+                                             .line_color = system_palette.syntax_comment(),
                                              .text_formatter = [&memory_graph](int value) {
                                                  return String::formatted("Committed: {} KiB", value);
                                              },
                                          });
         memory_graph.set_value_format(1, {
-                                             .line_color = Color::Blue,
-                                             .background_color = Color::from_rgb(0xaaaaff),
+                                             .line_color = system_palette.syntax_preprocessor_statement(),
                                              .text_formatter = [&memory_graph](int value) {
                                                  return String::formatted("Allocated: {} KiB", value);
                                              },
                                          });
         memory_graph.set_value_format(2, {
-                                             .line_color = Color::Red,
-                                             .background_color = Color::from_rgb(0xffaaaa),
+                                             .line_color = system_palette.syntax_preprocessor_value(),
                                              .text_formatter = [&memory_graph](int value) {
                                                  return String::formatted("Kernel heap: {} KiB", value);
                                              },