Update list.focusBackground (codesandbox#3084)

Author: siddharthkp

packages/common/src/themes/codesandbox-black.js

@@ -154,9 +154,9 @@ const colors = {
     activeSelectionBackground: tokens.grays[700],
     activeSelectionForeground: tokens.white,
     dropBackground: tokens.grays[700],
-    focusBackground: tokens.grays[700],
     highlightForeground: tokens.blues[300],
     hoverBackground: tokens.grays[500],
+    focusBackground: tokens.grays[500],
     inactiveSelectionBackground: null,
     inactiveSelectionForeground: null,
     warningForeground: tokens.yellow,