diff --git a/addons/mail/static/src/core/common/autoresize_input.scss b/addons/mail/static/src/core/common/autoresize_input.scss
index fbe9b00d43d..e008303ec03 100644
--- a/addons/mail/static/src/core/common/autoresize_input.scss
+++ b/addons/mail/static/src/core/common/autoresize_input.scss
@@ -1,9 +1,11 @@
 .o-mail-AutoresizeInput:not([disabled]):focus {
-    border-color: map-get($theme-colors, "dark");
+    border-color: map-get($theme-colors, "dark") !important;
     background-color: $white;
 }
 
 .o-mail-AutoresizeInput:not([disabled]):hover {
     background-color: $white;
-    border: $border-width solid $border-color;
+    &:not(:focus) {
+        border: $border-width solid $border-color !important;
+    }
 }