diff --git a/phpBB/styles/prosilver/template/posting_pm_header.html b/phpBB/styles/prosilver/template/posting_pm_header.html
index 738d5b25f2..aecd98eacc 100644
--- a/phpBB/styles/prosilver/template/posting_pm_header.html
+++ b/phpBB/styles/prosilver/template/posting_pm_header.html
@@ -31,7 +31,11 @@
 					<ul class="recipients">
 						<!-- BEGIN to_recipient -->
 						<li>
-							<!-- IF not S_EDIT_POST --><input type="submit" name="remove_{to_recipient.TYPE}[{to_recipient.UG_ID}]" value="{L_REMOVE}" class="button2" /><!-- ENDIF -->
+							<!-- IF not S_EDIT_POST -->
+								<button type="submit" name="remove_{to_recipient.TYPE}[{to_recipient.UG_ID}]">
+									<i class="icon fa-times icon-red" aria-hidden="true"></i><span class="sr-only">{L_REMOVE}</span>
+								</button>
+							<!-- ENDIF -->
 							<!-- IF to_recipient.IS_GROUP --><a href="{to_recipient.U_VIEW}" style="color: {{ to_recipient.COLOUR }}"><strong>{to_recipient.NAME}</strong></a><!-- ELSE -->{to_recipient.NAME_FULL}<!-- ENDIF -->
 						</li>
 						<!-- END to_recipient -->
@@ -48,7 +52,11 @@
 					<ul class="recipients">
 						<!-- BEGIN bcc_recipient -->
 						<li>
-							<!-- IF not S_EDIT_POST --><input type="submit" name="remove_{bcc_recipient.TYPE}[{bcc_recipient.UG_ID}]" value="{L_REMOVE}" class="button2" /><!-- ENDIF -->
+							<!-- IF not S_EDIT_POST -->
+								<button type="submit" name="remove_{bcc_recipient.TYPE}[{bcc_recipient.UG_ID}]">
+									<i class="icon fa-times icon-red" aria-hidden="true"></i><span class="sr-only">{L_REMOVE}</span>
+								</button>
+							<!-- ENDIF -->
 							<!-- IF bcc_recipient.IS_GROUP --><a href="{bcc_recipient.U_VIEW}" style="color: {{ bcc_recipient.COLOUR }}"><strong>{bcc_recipient.NAME}</strong></a><!-- ELSE -->{bcc_recipient.NAME_FULL}<!-- ENDIF -->
 						</li>
 						<!-- END bcc_recipient -->