diff --git a/scss/moineau.scss b/scss/moineau.scss
index d4c509d..1c12fa4 100644
--- a/scss/moineau.scss
+++ b/scss/moineau.scss
@@ -258,6 +258,7 @@ label {
 
 textarea {
   width: 100%;
+  box-sizing: border-box;
   margin-bottom: 1rem;
 }