diff --git a/assets/img/thumbnail-images/general-a11y.png b/assets/img/thumbnail-images/general-a11y.png index 3af4144a..22f1a0de 100644 Binary files a/assets/img/thumbnail-images/general-a11y.png and b/assets/img/thumbnail-images/general-a11y.png differ diff --git a/assets/img/thumbnail-images/playbook.png b/assets/img/thumbnail-images/playbook.png index cd6cd094..270dd851 100644 Binary files a/assets/img/thumbnail-images/playbook.png and b/assets/img/thumbnail-images/playbook.png differ diff --git a/assets/img/thumbnail-images/tip-of-the-week.png b/assets/img/thumbnail-images/tip-of-the-week.png index 0d657e71..2697a76d 100644 Binary files a/assets/img/thumbnail-images/tip-of-the-week.png and b/assets/img/thumbnail-images/tip-of-the-week.png differ