diff --git a/docs/content/showcase/humboldtux.md b/docs/content/showcase/humboldtux.md
index 7ca385a18..edcddc0d1 100644
--- a/docs/content/showcase/humboldtux.md
+++ b/docs/content/showcase/humboldtux.md
@@ -8,7 +8,6 @@ sourceLink: https://github.com/humboldtux/humboldtux.github.io
 tags:
 - personal
 - blog
-thumbnail: /img/humboldtux-tn.jpg
+thumbnail: /img/humboldtux-tn.png
 title: humboldtux.net
 ---
-
diff --git a/docs/content/showcase/richardsumilang.md b/docs/content/showcase/richardsumilang.md
index c93667fd1..aef9838fd 100644
--- a/docs/content/showcase/richardsumilang.md
+++ b/docs/content/showcase/richardsumilang.md
@@ -11,7 +11,6 @@ tags:
 - technical
 - electronics
 - reviews
-thumbnail: /img/richardsumilang-tn.jpg
+thumbnail: /img/richardsumilang-tn.png
 title: Richard Sumilang - Top Secret Labs
 ---
-
diff --git a/docs/static/img/chinese-grammar-tn.png b/docs/static/img/chinese-grammar-tn.png
index 340722ae4..e0ea219a6 100644
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diff --git a/docs/static/img/gig.png b/docs/static/img/gig.png
index 0de419bed..6b2959783 100644
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diff --git a/docs/static/img/humboldtux-tn.png b/docs/static/img/humboldtux-tn.png
index 9dce08586..ca330ae19 100644
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