diff --git a/sandbox/basic.css b/sandbox/basic.css
index 16e2220e4..3f78e4bca 100644
--- a/sandbox/basic.css
+++ b/sandbox/basic.css
@@ -40,7 +40,7 @@ App > Screen {
   background: $primary-darken-2;
   color: $text-primary-darken-2 ;
   border-right: outer $primary-darken-3;
-  content-align: center middle;
+  content-align: center middle;  
 }
 
 #sidebar .user {
@@ -168,7 +168,7 @@ OptionItem {
   height: 3;
   background: $primary;
   border-right: outer $primary-darken-2;
-  border-left: hidden;
+  border-left: blank;
   content-align: center middle;
 }
 
@@ -223,4 +223,4 @@ Success {
 
 .horizontal {
   layout: horizontal
-}
\ No newline at end of file
+}
diff --git a/sandbox/horizontal.css b/sandbox/horizontal.css
index 7e2f78dcc..1980ad5f4 100644
--- a/sandbox/horizontal.css
+++ b/sandbox/horizontal.css
@@ -7,12 +7,14 @@ Horizontal {
 .test {
     width: auto;
     height: auto;
-
+    height: 5;
     background: white 50%;
-    border:solid green;   
+    /* border:solid green;    */
+    border-right: outer green; 
+    border-left: outer blue;
     padding: 0;
     margin:3;
 
     align: center middle;
-    box-sizing: content-box;
-} 
\ No newline at end of file
+    box-sizing: border-box;
+} 
diff --git a/src/textual/_border.py b/src/textual/_border.py
index 9f060a45d..b720fd5ff 100644
--- a/src/textual/_border.py
+++ b/src/textual/_border.py
@@ -22,7 +22,7 @@ OUTER = 2
 
 BORDER_CHARS: dict[EdgeType, tuple[str, str, str]] = {
     # Each string of the tuple represents a sub-tuple itself:
-    #  - 1st string represents `(top1, top2, top3)`
+    #  - 1st string represents (top1, top2, top3)
     #  - 2nd string represents (mid1, mid2, mid3)
     #  - 3rd string represents (bottom1, bottom2, bottom3)
     "": ("   ", "   ", "   "),
@@ -128,7 +128,7 @@ class Border:
 
     This is analogous to Rich's `Box` but more flexible. Different borders may be
     applied to each of the four edges, and more advanced borders can be achieved through
-    varions combinations of Widget and parent background colors.
+    various combinations of Widget and parent background colors.
 
     """
 
@@ -150,12 +150,8 @@ class Border:
             (bottom, bottom_color),
             (left, left_color),
         ) = edge_styles
-        self._sides: tuple[EdgeType, EdgeType, EdgeType, EdgeType] = (
-            top or "none",
-            right or "none",
-            bottom or "none",
-            left or "none",
-        )
+        self._sides: tuple[EdgeType, EdgeType, EdgeType, EdgeType]
+        self._sides = (top, right, bottom, left)
         from_color = Style.from_color
 
         self._styles = (
@@ -204,6 +200,7 @@ class Border:
     def __rich_console__(
         self, console: "Console", options: "ConsoleOptions"
     ) -> "RenderResult":
+
         top, right, bottom, left = self._sides
         style = console.get_style(self.inner_style)
         outer_style = console.get_style(self.outer_style)