add fill in _apply-colors-light.scss

src/client/js/components/SlackLogo.jsx

@@ -6,7 +6,6 @@ const SlackLogo = () => (
     viewBox="0 0 448 448"
     height="20"
     width="20"
-    fill="purple"
     className="grw-slack-notification-sm"
   >
     <path

src/client/styles/scss/theme/_apply-colors-dark.scss

@@ -261,6 +261,7 @@ ul.pagination {
 .grw-slack-notification-sm {
   background-color: $secondary;
   border-color: transparent;
+  fill: #dd80de;
 }
 
 /*

src/client/styles/scss/theme/_apply-colors-light.scss

@@ -194,6 +194,7 @@ $table-hover-bg: $bgcolor-table-hover;
 .grw-slack-notification-sm {
   background-color: $light;
   border-color: transparent;
+  fill: purple;
 }
 
 /*