diff --git a/adminer.css b/adminer.css
index 7830408..b3a9043 100644
--- a/adminer.css
+++ b/adminer.css
@@ -12,6 +12,7 @@ https://raw.github.com/vrana/adminer/master/designs/ng9/adminer.css
     color: #333;
     margin: 0;
     padding: 0;
+    box-sizing: border-box;
 }
 
 body {