diff --git a/phpBB/styles/prosilver/theme/colours.css b/phpBB/styles/prosilver/theme/colours.css
index bd0c6f5ac7..fd8fdb1d1a 100644
--- a/phpBB/styles/prosilver/theme/colours.css
+++ b/phpBB/styles/prosilver/theme/colours.css
@@ -1341,16 +1341,6 @@ input.disabled {
 	background: #ffffff;
 }
 
-@-webkit-keyframes animate {
-	0% {
-		background: #0076b1;
-	}
-
-	50% {
-		background: #d31141;
-	}
-}
-
 @keyframes animate {
 	0% {
 		background: #0076b1;
diff --git a/phpBB/styles/prosilver/theme/common.css b/phpBB/styles/prosilver/theme/common.css
index 957ea3b9b7..9c8c6d098d 100644
--- a/phpBB/styles/prosilver/theme/common.css
+++ b/phpBB/styles/prosilver/theme/common.css
@@ -1065,26 +1065,6 @@ fieldset.fields1 dl.pmlist dd.recipients {
 	animation: before 1s ease-in-out infinite;
 }
 
-@-webkit-keyframes before {
-	0% {
-		opacity: 0.5;
-		transform: rotateY(0);
-		transform-origin: left center;
-	}
-
-	30%,
-	70% {
-		opacity: 0.2;
-		transform: rotateY(180deg);
-		transform-origin: left center;
-	}
-
-	100% {
-		opacity: 0.5;
-		transform: rotateY(0);
-	}
-}
-
 @keyframes before {
 	0% {
 		opacity: 0.5;