diff --git a/app/static/css/app.css b/app/static/css/app.css
index 72887c8..b2ff00f 100644
--- a/app/static/css/app.css
+++ b/app/static/css/app.css
@@ -1,3 +1,4 @@
+*,*::after,*::before {box-sizing: border-box;}
 body { min-height: 100vh; background: var(--bs-tertiary-bg); }
 pre { white-space: pre-wrap; }
 html, body { overflow-x: hidden; }