diff --git a/phpBB/styles/prosilver/theme/colours.css b/phpBB/styles/prosilver/theme/colours.css
index 29cf641df2..8ea41ef95f 100644
--- a/phpBB/styles/prosilver/theme/colours.css
+++ b/phpBB/styles/prosilver/theme/colours.css
@@ -978,10 +978,18 @@ fieldset.quick-login input.inputbox {
 }
 
 #message-box textarea.drag-n-drop {
+	-webkit-outline-color: rgba(102, 102, 102, 0.5);
+	-moz-outline-color: rgba(102, 102, 102, 0.5);
+	-ms-outline-color: rgba(102, 102, 102, 0.5);
+	-o-outline-color: rgba(102, 102, 102, 0.5);
 	outline-color: rgba(102, 102, 102, 0.5);
 }
 
 #message-box textarea.drag-n-drop-highlight {
+	-webkit-outline-color: rgba(17, 163, 234, 0.5);
+	-moz-outline-color: rgba(17, 163, 234, 0.5);
+	-ms-outline-color: rgba(17, 163, 234, 0.5);
+	-o-outline-color: rgba(17, 163, 234, 0.5);
 	outline-color: rgba(17, 163, 234, 0.5);
 }
 
diff --git a/phpBB/styles/prosilver/theme/forms.css b/phpBB/styles/prosilver/theme/forms.css
index 11e0583542..ed2c253cf1 100644
--- a/phpBB/styles/prosilver/theme/forms.css
+++ b/phpBB/styles/prosilver/theme/forms.css
@@ -243,9 +243,21 @@ fieldset.submit-buttons input {
 	max-width: 100%;
 	font-size: 1.2em;
 	resize: vertical;
+	-webkit-outline: 3px dashed transparent;
+	-moz-outline: 3px dashed transparent;
+	-ms-outline: 3px dashed transparent;
+	-o-outline: 3px dashed transparent;
 	outline: 3px dashed transparent;
+	-webkit-outline-offset: -4px;
+	-moz-outline-offset: -4px;
+	-ms-outline-offset: -4px;
+	-o-outline-offset: -4px;
 	outline-offset: -4px;
-	transition: .5s;
+	-webkit-transition: all .5s ease;
+	-moz-transition: all .5s ease;
+	-ms-transition: all .5s ease;
+	-o-transition: all .5s ease;
+	transition: all .5s ease;
 }
 
 /* Emoticons panel */