fix(ui): global body background color

Author: TkDodo

static/less/base.less

@@ -34,16 +34,16 @@ body {
 
 // Applied to body
 body.theme-dark {
-  // theme.surface200
-  background: #1A141F;
-  // theme.gray400
+  // theme.tokens.background.primary
+  background: #241D2A;
+  // theme.tokens.content.primary
   color: #D6D0DC;
 }
 body.theme-system {
   @media (prefers-color-scheme: dark) {
-    // theme.surface200
-    background: #1A141F;
-    // theme.gray400
+    // theme.tokens.background.primary
+    background: #241D2A;
+    // theme.content.primary
     color: #D6D0DC;
   }
 }