diff --git a/bec_widgets/widgets/text_box/text_box.py b/bec_widgets/widgets/text_box/text_box.py
index f5785022..b1446d29 100644
--- a/bec_widgets/widgets/text_box/text_box.py
+++ b/bec_widgets/widgets/text_box/text_box.py
@@ -1,8 +1,30 @@
 import re
 
+from pydantic import Field, field_validator
 from qtpy.QtWidgets import QTextEdit
 
-from bec_widgets.utils import BECConnector
+from bec_widgets.utils.bec_connector import BECConnector, ConnectionConfig
+from bec_widgets.utils.colors import Colors
+
+
+class TextBoxConfig(ConnectionConfig):
+
+    theme: str = Field("dark", description="The theme of the figure widget.")
+    font_color: str = Field("#FFF", description="The font color of the text")
+    background_color: str = Field("#000", description="The background color of the widget.")
+    font_size: int = Field(16, description="The font size of the text in the widget.")
+    text: str = Field("", description="The text to display in the widget.")
+
+    @classmethod
+    @field_validator("theme")
+    def validate_theme(cls, v):
+        """Validate the theme of the figure widget."""
+        if v not in ["dark", "light"]:
+            raise ValueError("Theme must be either 'dark' or 'light'")
+        return v
+
+    _validate_font_color = field_validator("font_color")(Colors.validate_color)
+    _validate_background_color = field_validator("background_color")(Colors.validate_color)
 
 
 class TextBox(BECConnector, QTextEdit):
@@ -10,48 +32,76 @@ class TextBox(BECConnector, QTextEdit):
     USER_ACCESS = ["set_color", "set_text", "set_font_size"]
 
     def __init__(self, text: str = "", parent=None, client=None, config=None, gui_id=None):
+        if config is None:
+            config = TextBoxConfig(widget_class=self.__class__.__name__)
+        else:
+            if isinstance(config, dict):
+                config = TextBoxConfig(**config)
+            self.config = config
         super().__init__(client=client, config=config, gui_id=gui_id)
         QTextEdit.__init__(self, parent=parent)
 
+        self.config = config
         self.setReadOnly(True)
-        self._background_color = "#FFF"
-        self._font_color = "#000"
-        self._font_size = 12
-        self.set_color(self._background_color, self._font_color)
         self.setGeometry(self.rect())
-        self._text = text
+        self.set_color(self.config.background_color, self.config.font_color)
+        if not text:
+            text = "<h1>Welcome to the BEC Widget TextBox</h1><p>A widget that allows user to display text in plain and HTML format.</p><p>This is an example of displaying HTML text.</p>"
         self.set_text(text)
 
+    def change_theme(self) -> None:
+        """
+        Change the theme of the figure widget.
+        """
+        if self.config.theme == "dark":
+            theme = "light"
+            font_color = "#000"
+            background_color = "#FFF"
+        else:
+            theme = "dark"
+            font_color = "#FFF"
+            background_color = "#000"
+        self.config.theme = theme
+        self.set_color(background_color, font_color)
+
     def set_color(self, background_color: str, font_color: str) -> None:
-        """Set the background color of the Widget.
+        """Set the background color of the widget.
 
         Args:
             background_color (str): The color to set the background in HEX.
             font_color (str): The color to set the font in HEX.
 
         """
-        self._background_color = background_color
-        self._font_color = font_color
+        self.config.background_color = background_color
+        self.config.font_color = font_color
         self._update_stylesheet()
 
     def set_font_size(self, size: int) -> None:
-        """Set the font size of the text in the Widget."""
-        self._font_size = size
+        """Set the font size of the text in the widget.
+
+        Args:
+            size (int): The font size to set.
+        """
+        self.config.font_size = size
         self._update_stylesheet()
 
     def _update_stylesheet(self):
         """Update the stylesheet of the widget."""
         self.setStyleSheet(
-            f"background-color: {self._background_color}; color: {self._font_color}; font-size: {self._font_size}px"
+            f"background-color: {self.config.background_color}; color: {self.config.font_color}; font-size: {self.config.font_size}px"
         )
 
     def set_text(self, text: str) -> None:
-        """Set the text of the Widget"""
+        """Set the text of the widget.
+
+        Args:
+            text (str): The text to set.
+        """
         if self.is_html(text):
             self.setHtml(text)
         else:
             self.setPlainText(text)
-        self._text = text
+        self.config.text = text
 
     def is_html(self, text: str) -> bool:
         """Check if the text contains HTML tags.
diff --git a/tests/unit_tests/test_text_box_widget.py b/tests/unit_tests/test_text_box_widget.py
index 95fa0877..51af87a4 100644
--- a/tests/unit_tests/test_text_box_widget.py
+++ b/tests/unit_tests/test_text_box_widget.py
@@ -18,26 +18,38 @@ def text_box_widget(qtbot, mocked_client):
 
 
 def test_textbox_widget(text_box_widget):
-
-    text_box_widget.set_text("Hello World!")
-    # pylint: disable=protected-access
-    assert text_box_widget._text == "Hello World!"
+    """Test the TextBox widget."""
+    text = "Hello World!"
+    text_box_widget.set_text(text)
+    assert text_box_widget.toPlainText() == text
 
     text_box_widget.set_color("#FFDDC1", "#123456")
     text_box_widget.set_font_size(20)
     assert (
         text_box_widget.styleSheet() == "background-color: #FFDDC1; color: #123456; font-size: 20px"
     )
+    text_box_widget.set_color("white", "blue")
+    text_box_widget.set_font_size(14)
+    assert text_box_widget.styleSheet() == "background-color: white; color: blue; font-size: 14px"
+    text = "<h1>Welcome to PyQt6</h1><p>This is an example of displaying <strong>HTML</strong> text.</p>"
+    with mock.patch.object(text_box_widget, "setHtml") as mocked_set_html:
+        text_box_widget.set_text(text)
+        assert mocked_set_html.call_count == 1
+        assert mocked_set_html.call_args == mock.call(text)
 
-    with mock.patch.object(text_box_widget, "setHtml") as mock_set_plain_text:
-        text_box_widget.set_text(
-            "<h1>Welcome to PyQt6</h1><p>This is an example of displaying <strong>HTML</strong> text.</p>"
-        )
-        assert mock_set_plain_text.call_args == mock.call(
-            "<h1>Welcome to PyQt6</h1><p>This is an example of displaying <strong>HTML</strong> text.</p>"
-        )
-        # pylint: disable=protected-access
-        assert (
-            text_box_widget._text
-            == "<h1>Welcome to PyQt6</h1><p>This is an example of displaying <strong>HTML</strong> text.</p>"
-        )
+
+def test_textbox_change_theme(text_box_widget):
+    """Test change theme functionaility"""
+    # Default is dark theme
+    text_box_widget.change_theme()
+    assert text_box_widget.config.theme == "light"
+    assert (
+        text_box_widget.styleSheet()
+        == f"background-color: #FFF; color: #000; font-size: {text_box_widget.config.font_size}px"
+    )
+    text_box_widget.change_theme()
+    assert text_box_widget.config.theme == "dark"
+    assert (
+        text_box_widget.styleSheet()
+        == f"background-color: #000; color: #FFF; font-size: {text_box_widget.config.font_size}px"
+    )