diff --git a/styles/_common.scss b/styles/_common.scss
index 7052df8..5d05d8d 100644
--- a/styles/_common.scss
+++ b/styles/_common.scss
@@ -10,6 +10,9 @@ body {
     line-height: 1.5;
     margin: 0;
 }
+* {
+    box-sizing: border-box;
+}
 .container {
     margin: 0 auto;
     padding: 0 1rem;