Change guest name color to white when top bar become transparent.

Signed-off-by: Ivan Sein <ivan@nextcloud.com>

css/style.css

@@ -561,7 +561,7 @@ video {
 }
 
 #guestName:hover {
-	color: #fff;
+	color: #fff !important;
 }
 
 #guestNameInput {
@@ -588,3 +588,8 @@ video {
 #body-public #app-content:not(.participants-1) #header.spreed-public {
 	background: transparent;
 }
+
+/* make guest name white because header bar is transparent*/
+#body-public #app-content:not(.participants-1) #guestName {
+    color: rgba(255, 255, 255, 0.7);
+}