diff --git a/css/style.css b/css/style.css
index d1cc5a2..0869689 100644
--- a/css/style.css
+++ b/css/style.css
@@ -23,9 +23,9 @@ body.adminimal-theme *::-moz-focus-inner {
 }
 
 body.adminimal-theme * {
-  -moz-box-sizing: inherit;
-  -webkit-box-sizing: inherit;
-  box-sizing: inherit;
+  -moz-box-sizing: border-box;
+  -webkit-box-sizing: border-box;
+  box-sizing: border-box;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
 }