diff --git a/src/_base.css b/src/_base.css
index b01c830..6917e86 100644
--- a/src/_base.css
+++ b/src/_base.css
@@ -14,17 +14,18 @@
   --font-family-mono: monaco, "Consolas", "Lucida Console", monospace;
 }
 
-* {
-  box-sizing: border-box;
-}
-
 html {
+  box-sizing: border-box;
   font-size: 62.5%;
   line-height: 1.15;
   -ms-text-size-adjust: 100%;
   -webkit-text-size-adjust: 100%;
 }
 
+*, *:before, *:after {
+  box-sizing: inherit;
+}
+
 body {
   line-height: 1.6;
   font-size: var(--font-size);