diff --git a/_layouts/index.html b/_layouts/index.html
index 8cfaa4b9fd17cb53155d620b31fb39880482dc34..440048a246ae63c3149221571cf89b9d0e04c6f6 100644
--- a/_layouts/index.html
+++ b/_layouts/index.html
@@ -22,9 +22,12 @@ layout: default
 
           <div class="index-photo">
             <picture>
-              <source media="(min-width: 200px)" srcset="{{ '/assets/cover_big.webp' | relative_url }}" alt="Elixir Luxembourg" />
-              <source media="(max-width: 200px)" srcset="{{ '/assets/cover_small.webp' | relative_url }}" alt="Elixir Luxembourg" />
-              <img src="{{ '/assets/cover_small.webp' | relative_url }}" alt="Elixir Luxembourg" />
+              <source media="(min-width: 200px)" srcset="{{ '/assets/cover_big.webp' | relative_url }}" type="image/webp" alt="Elixir Luxembourg" />
+              <source media="(max-width: 200px)" srcset="{{ '/assets/cover_small.webp' | relative_url }}" type="image/webp" alt="Elixir Luxembourg" />
+
+              <source media="(min-width: 200px)" srcset="{{ '/assets/cover_big.jpg' | relative_url }}" type="image/jpeg" alt="Elixir Luxembourg" />
+              <source media="(max-width: 200px)" srcset="{{ '/assets/cover_small.jpg' | relative_url }}" type="image/jpeg" alt="Elixir Luxembourg" />
+              <img src="{{ '/assets/cover_small.jpg' | relative_url }}" type="image/jpeg" alt="Elixir Luxembourg" />
             </picture>
           </div>
         </div>
diff --git a/assets/cover_big.jpg b/assets/cover_big.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..918c1354c88597a291b6333fd4b645b7dfe55b11
Binary files /dev/null and b/assets/cover_big.jpg differ
diff --git a/assets/cover_small.jpg b/assets/cover_small.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..12f52179ee7a088117a993f2594ea1c2a66d9d48
Binary files /dev/null and b/assets/cover_small.jpg differ
diff --git a/elixir-theme.gemspec b/elixir-theme.gemspec
index 63154980b3e02356e63f3e52ae8c9702e1b7bb41..a0919a22c96e955ef2bfbda155c145fc2267cbe6 100644
--- a/elixir-theme.gemspec
+++ b/elixir-theme.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |spec|
   spec.name          = "jekyll-elixir-theme"
-  spec.version       = "0.9.18"
+  spec.version       = "0.9.19"
   spec.authors       = ["jacek.lebioda"]
   spec.email         = ["jacek.lebioda@uni.lu"]