fix design

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

@@ -259,19 +259,19 @@ ul.pagination {
 }
 
 .grw-slack-notification-sm {
-  fill: #4b144c;
+  fill: #dd80de;
 }
 
 .grw-slack-btn-sm {
-  background-color: $secondary;
+  background-color: black;
 }
 
 .grw-slack-btn-sm:focus {
-  background-color: $secondary;
+  background-color: black;
 }
 
 .grw-slack-btn-triangle {
-  color: #505050;
+  color: $secondary;
 }
 
 /*

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

@@ -192,7 +192,7 @@ $table-hover-bg: $bgcolor-table-hover;
 }
 
 .grw-slack-notification-sm {
-  fill: purple;
+  fill: #af30b0;
 }
 
 .grw-slack-btn-sm {
@@ -208,7 +208,7 @@ $table-hover-bg: $bgcolor-table-hover;
 }
 
 .grw-slack-btn-triangle {
-  color: gray;
+  color: $secondary;
 }
 
 /*