diff --git a/packages/react-devtools-shared/src/devtools/views/DevTools.css b/packages/react-devtools-shared/src/devtools/views/DevTools.css
index dd6b0d81e78b6..3332c35f1f677 100644
--- a/packages/react-devtools-shared/src/devtools/views/DevTools.css
+++ b/packages/react-devtools-shared/src/devtools/views/DevTools.css
@@ -53,3 +53,9 @@
     display: none;
   }
 }
+
+.DevTools, .DevTools * {
+  box-sizing: border-box;
+
+  -webkit-font-smoothing: var(--font-smoothing);
+}
diff --git a/packages/react-devtools-shared/src/devtools/views/root.css b/packages/react-devtools-shared/src/devtools/views/root.css
index a55d4300d54ff..55610f824772c 100644
--- a/packages/react-devtools-shared/src/devtools/views/root.css
+++ b/packages/react-devtools-shared/src/devtools/views/root.css
@@ -182,9 +182,3 @@
   --interaction-commit-size: 10px;
   --interaction-label-width: 200px;
 }
-
-* {
-  box-sizing: border-box;
-
-  -webkit-font-smoothing: var(--font-smoothing);
-}