diff --git a/pages/02.tutorials/01.User/02.GDPR/01.Nextcloud/thumb.png b/pages/02.tutorials/01.User/02.GDPR/01.Nextcloud/thumb.png
index f200a5b6..037172ba 100644
Binary files a/pages/02.tutorials/01.User/02.GDPR/01.Nextcloud/thumb.png and b/pages/02.tutorials/01.User/02.GDPR/01.Nextcloud/thumb.png differ
diff --git a/pages/02.tutorials/01.User/02.GDPR/02.Diaspora/thumb.png b/pages/02.tutorials/01.User/02.GDPR/02.Diaspora/thumb.png
index 922435d0..68f61c1b 100644
Binary files a/pages/02.tutorials/01.User/02.GDPR/02.Diaspora/thumb.png and b/pages/02.tutorials/01.User/02.GDPR/02.Diaspora/thumb.png differ
diff --git a/pages/02.tutorials/01.User/02.GDPR/03.Discourse/thumb.png b/pages/02.tutorials/01.User/02.GDPR/03.Discourse/thumb.png
index 0395c30d..2ced1bc3 100644
Binary files a/pages/02.tutorials/01.User/02.GDPR/03.Discourse/thumb.png and b/pages/02.tutorials/01.User/02.GDPR/03.Discourse/thumb.png differ
diff --git a/pages/02.tutorials/01.User/02.GDPR/04.Taiga/thumb.png b/pages/02.tutorials/01.User/02.GDPR/04.Taiga/thumb.png
index a901d492..b7417535 100644
Binary files a/pages/02.tutorials/01.User/02.GDPR/04.Taiga/thumb.png and b/pages/02.tutorials/01.User/02.GDPR/04.Taiga/thumb.png differ
diff --git a/pages/02.tutorials/01.User/02.GDPR/05.Hubzilla/thumb.png b/pages/02.tutorials/01.User/02.GDPR/05.Hubzilla/thumb.png
index 75b1b52c..167636df 100644
Binary files a/pages/02.tutorials/01.User/02.GDPR/05.Hubzilla/thumb.png and b/pages/02.tutorials/01.User/02.GDPR/05.Hubzilla/thumb.png differ
diff --git a/pages/02.tutorials/02.Cloud/04.Clients/02.Mobile/thumb.jpeg b/pages/02.tutorials/02.Cloud/04.Clients/02.Mobile/thumb.jpeg
deleted file mode 100755
index 1e1d59f3..00000000
Binary files a/pages/02.tutorials/02.Cloud/04.Clients/02.Mobile/thumb.jpeg and /dev/null differ
diff --git a/pages/02.tutorials/02.Cloud/04.Clients/02.Mobile/thumb.png b/pages/02.tutorials/02.Cloud/04.Clients/02.Mobile/thumb.png
new file mode 100644
index 00000000..d80baf31
Binary files /dev/null and b/pages/02.tutorials/02.Cloud/04.Clients/02.Mobile/thumb.png differ
diff --git a/pages/02.tutorials/03.Email/04.Clients/01.Desktop/thumb.png b/pages/02.tutorials/03.Email/04.Clients/01.Desktop/thumb.png
index 388956af..e323881f 100644
Binary files a/pages/02.tutorials/03.Email/04.Clients/01.Desktop/thumb.png and b/pages/02.tutorials/03.Email/04.Clients/01.Desktop/thumb.png differ
diff --git a/pages/02.tutorials/03.Email/04.Clients/02.Mobile/thumb.png b/pages/02.tutorials/03.Email/04.Clients/02.Mobile/thumb.png
index 1cd7cc31..274ef7dc 100644
Binary files a/pages/02.tutorials/03.Email/04.Clients/02.Mobile/thumb.png and b/pages/02.tutorials/03.Email/04.Clients/02.Mobile/thumb.png differ