diff --git a/sandbox/uber.py b/sandbox/uber.py
index 04f5987e9..ab0ae9cd4 100644
--- a/sandbox/uber.py
+++ b/sandbox/uber.py
@@ -85,7 +85,7 @@ class BasicApp(App):
 
     def action_increase_margin(self):
         old_margin = self.focused.styles.margin
-        self.focused.styles.border = [("solid", "green"), ("dashed", "s")]
+        self.focused.styles.border = [("solid", "green"), ("dashed", "red")]
 
 
 BasicApp.run(css_file="uber.css", log="textual.log", log_verbosity=1)
diff --git a/src/textual/css/_help_text.py b/src/textual/css/_help_text.py
index 7d3707e7f..8ca1bf07e 100644
--- a/src/textual/css/_help_text.py
+++ b/src/textual/css/_help_text.py
@@ -267,7 +267,7 @@ def border_property_help_text(
                                 f'widget.styles.{property_name} = ("solid", "red")'
                             ),
                             Example(
-                                f'widget.styles.{property_name} = ("round", #f0f0f0")'
+                                f'widget.styles.{property_name} = ("round", "#f0f0f0")'
                             ),
                             Example(
                                 f'widget.styles.{property_name} = [("dashed", "#f0f0f0"), ("solid", "blue")]  [dim]# Vertical, horizontal'
@@ -275,7 +275,7 @@ def border_property_help_text(
                         ],
                     ),
                     Bullet(
-                        f"Valid values for <bordertype> are:\n  {friendly_list(VALID_BORDER)}"
+                        f"Valid values for <bordertype> are:\n{friendly_list(VALID_BORDER)}"
                     ),
                     Bullet(
                         f"Colors can be specified using hex, RGB, or ANSI color names"
diff --git a/src/textual/css/_style_properties.py b/src/textual/css/_style_properties.py
index e615c0b12..97a58c5d1 100644
--- a/src/textual/css/_style_properties.py
+++ b/src/textual/css/_style_properties.py
@@ -341,7 +341,10 @@ class BorderProperty:
             setattr(obj, bottom, _border3)
             setattr(obj, left, _border4)
         else:
-            raise StyleValueError("expected 1, 2, or 4 values")
+            raise StyleValueError(
+                "expected 1, 2, or 4 values",
+                help_text=border_property_help_text(self.name, context="inline"),
+            )
         obj.refresh(layout=self._layout)