diff --git a/addons/mail/static/src/core/common/message.js b/addons/mail/static/src/core/common/message.js
index fe1aa6a12d3..f457546903a 100644
--- a/addons/mail/static/src/core/common/message.js
+++ b/addons/mail/static/src/core/common/message.js
@@ -159,7 +159,7 @@ export class Message extends Component {
             "py-1": !this.props.squashed,
             "mt-2": !this.props.squashed && this.props.thread,
             "px-3": !this.props.isInChatWindow,
-            "px-1": this.props.isInChatWindow,
+            "px-2": this.props.isInChatWindow,
             "opacity-50": this.props.messageToReplyTo?.isNotSelected(
                 this.props.thread,
                 this.props.message
diff --git a/addons/mail/static/src/core/common/primary_variables.scss b/addons/mail/static/src/core/common/primary_variables.scss
index cfaa3aa79ef..9a92623d913 100644
--- a/addons/mail/static/src/core/common/primary_variables.scss
+++ b/addons/mail/static/src/core/common/primary_variables.scss
@@ -9,7 +9,7 @@ $o-mail-LinkPreview-width: 320px !default;
 $o-mail-LinkPreview-height: 240px !default;
 $o-mail-LinkPreviewCard-height: 80px !default;
 
-$o-mail-Message-sidebarWidth: 48px !default;
+$o-mail-Message-sidebarWidth: 42px !default;
 $o-mail-NavigableList-zIndex: 11;
 $o-mail-Chatter-minWidth: 530px !default;
 $o-mail-Discuss-inspector: 300px !default;
diff --git a/addons/mail/static/src/scss/variables/primary_variables.scss b/addons/mail/static/src/scss/variables/primary_variables.scss
index e8bbff64643..0dffc7ddce0 100644
--- a/addons/mail/static/src/scss/variables/primary_variables.scss
+++ b/addons/mail/static/src/scss/variables/primary_variables.scss
@@ -9,7 +9,7 @@ $o-mail-partner-status-icon-size: 1.2em !default;
 $o-RoundedRectangle-small: .2rem !default;
 $o-RoundedRectangle-large: 3 * $o-RoundedRectangle-small !default;
 
-$o-mail-Message-sidebarWidth: 48px !default;
+$o-mail-Message-sidebarWidth: 42px !default;
 $o-mail-composer-text-input-height: 40px !default;
 
 $o-mail-LinkPreview-width: 320px !default;