diff --git a/src/frontend/styles/components/header.pcss b/src/frontend/styles/components/header.pcss
index 41c6e56..b80065b 100644
--- a/src/frontend/styles/components/header.pcss
+++ b/src/frontend/styles/components/header.pcss
@@ -7,6 +7,7 @@
   font-size: 18px;
   flex-wrap: wrap;
   position: fixed;
+  box-sizing: border-box;
   width: 100%;
   z-index: 2;
   background: white;