Tweaked caret colors to be more visible

Author: Brian Vaughn

packages/react-devtools-shared/src/devtools/views/root.css

@@ -113,8 +113,7 @@
   --light-color-search-match-current: #f7923b;
   --light-color-selected-tree-highlight-active: rgba(0, 136, 250, 0.1);
   --light-color-selected-tree-highlight-inactive: rgba(0, 0, 0, 0.05);
-  --light-color-scroll-caret: #d1d1d1;
-  --light-color-shadow: rgba(0, 0, 0, 0.25);
+  --light-color-scroll-caret: rgba(150, 150, 150, 0.5);
   --light-color-tab-selected-border: #0088fa;
   --light-color-text: #000000;
   --light-color-text-invalid: #ff0000;