diff --git a/addons/mail/static/src/components/composer_text_input/composer_text_input.scss b/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
index f4b9b225738..b9119a714d9 100644
--- a/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
+++ b/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
@@ -12,7 +12,7 @@
     position: absolute;
     opacity: 0;
     overflow: hidden;
-    top: -10000;
+    top: -10000px;
 }
 
 .o_ComposerTextInput_textareaStyle {