fix _apply-colors

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

@@ -259,10 +259,15 @@ ul.pagination {
 }
 
 .grw-slack-notification-sm {
-  fill: #dd80de;
+  fill: #4b144c;
 }
 
 .grw-slack-btn-sm {
+  background-color: $secondary;
+}
+
+.grw-slack-btn-sm:focus {
+  background-color: $secondary;
 }
 
 .grw-slack-btn-triangle {

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

@@ -203,6 +203,10 @@ $table-hover-bg: $bgcolor-table-hover;
   background-color: white;
 }
 
+.grw-slack-btn-sm:focus {
+  background-color: white;
+}
+
 .grw-slack-btn-triangle {
   color: gray;
 }