diff --git a/ts/domtools.elementbasic.ts b/ts/domtools.elementbasic.ts
index 67e4815..f4feb46 100644
--- a/ts/domtools.elementbasic.ts
+++ b/ts/domtools.elementbasic.ts
@@ -11,6 +11,7 @@ export const staticStyles = css`
   }
 
   :host {
+    box-sizing: border-box;
     font-family: 'Roboto', sans-serif;
   }