diff --git a/app/img/activity.png b/app/img/activity.png
index f1dedaf..56f8b3b 100644
Binary files a/app/img/activity.png and b/app/img/activity.png differ
diff --git a/app/img/explain.png b/app/img/explain.png
index ad86b8e..5b42576 100644
Binary files a/app/img/explain.png and b/app/img/explain.png differ
diff --git a/app/img/record.png b/app/img/record.png
index d6c60eb..fc42d0f 100644
Binary files a/app/img/record.png and b/app/img/record.png differ
diff --git a/app/img/share.png b/app/img/share.png
index a9f0fd5..63e5e94 100644
Binary files a/app/img/share.png and b/app/img/share.png differ