diff --git a/mail/templates/pixelegg/app.css b/mail/templates/pixelegg/app.css
index 07e1725093..3558647cc7 100755
--- a/mail/templates/pixelegg/app.css
+++ b/mail/templates/pixelegg/app.css
@@ -2616,3 +2616,11 @@ div.mailDisplayHeaders div.mail_extraEmails.visible {
 div.mailComposeHeaderSection > table {
   padding-top: 10px;
 }
+/* transition delay breaks splitter resize, because it doesn't get the right height
+	in a right time. So we reduce the delay to 0 to fix the timing issue.*/
+:hover {
+  -webkit-transition: all 0s ease-out;
+  -moz-transition: all 0s ease-out;
+  -o-transition: all 0s ease-out;
+  transition: all 0s ease-out;
+}
diff --git a/mail/templates/pixelegg/app.less b/mail/templates/pixelegg/app.less
index 8a399d662a..d6339d5ce4 100755
--- a/mail/templates/pixelegg/app.less
+++ b/mail/templates/pixelegg/app.less
@@ -1725,4 +1725,12 @@ div.mailDisplayHeaders div.mail_extraEmails.visible {
 div.mailComposeHeaderSection > table {
 	padding-top: 10px;
 }
-//
+
+/* transition delay breaks splitter resize, because it doesn't get the right height
+	in a right time. So we reduce the delay to 0 to fix the timing issue.*/
+:hover {
+	-webkit-transition: all 0s ease-out;
+	-moz-transition: all 0s ease-out;
+	-o-transition: all 0s ease-out;
+	transition: all 0s ease-out;
+}
\ No newline at end of file