diff --git a/pyflow/blocks/codeblock.py b/pyflow/blocks/codeblock.py
index b6dcc5b2..f17c400a 100644
--- a/pyflow/blocks/codeblock.py
+++ b/pyflow/blocks/codeblock.py
@@ -67,6 +67,8 @@ def __init__(self, source: str = "", **kwargs):
             QPen(QColor("#00ff00")),  # Transmitting
         ]
 
+        self.output_panel_background_color = "#1E1E1E"
+
         # Add output pannel
         self.output_panel = self.init_output_panel()
         self.run_button = self.init_run_button()
@@ -89,6 +91,10 @@ def init_output_panel(self):
         output_panel = QTextEdit()
         output_panel.setReadOnly(True)
         output_panel.setFont(self.source_editor.font())
+        style_sheet = (
+            f'QTextEdit {{ background-color: "{self.output_panel_background_color}"; }}'
+        )
+        output_panel.setStyleSheet(style_sheet)
         return output_panel
 
     def init_run_button(self):
diff --git a/pyflow/blocks/markdownblock.py b/pyflow/blocks/markdownblock.py
index bb173f47..182e5a8f 100644
--- a/pyflow/blocks/markdownblock.py
+++ b/pyflow/blocks/markdownblock.py
@@ -47,8 +47,9 @@ def __init__(self, **kwargs):
         self.splitter.addWidget(self.editor)
 
         self.rendered_markdown = QWebEngineView()
+        self.output_panel_background_color = "#1E1E1E"
         self.rendered_markdown.page().setBackgroundColor(
-            QColor.fromRgba64(0, 0, 0, alpha=0)
+            QColor(self.output_panel_background_color)
         )
 
         self.splitter.addWidget(self.rendered_markdown)
@@ -58,14 +59,14 @@ def valueChanged(self):
         """Update markdown rendering when the content of the markdown editor changes."""
         t = self.editor.text()
 
-        dark_theme = """
+        dark_theme =f'''
             <style>
-                *{
-                    background-color:transparent;
+                *{{
+                    background-color:"""{self.output_panel_background_color}""";
                     color:white;
-                }
+                }}
             </style>
-        """
+        '''
 
         self.rendered_markdown.setHtml(f"{dark_theme}{markdown(t)}")