diff --git a/adventskalender/2025/content/day01.html b/adventskalender/2025/content/day01.html
index 5e62527..403d2b1 100644
--- a/adventskalender/2025/content/day01.html
+++ b/adventskalender/2025/content/day01.html
@@ -63,26 +63,25 @@
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       poster="/2025/assets/images/1366/jpeg/Basisbild.jpeg"
     >
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-      <source src="/2025/assets/videos/4K/01.mp4"         type="video/mp4" media="(min-width: 2561px)">
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+<source src="/2025/assets/videos/FWVGA/webm/01.webm"     type="video/webm" media="(max-width: 854px)">
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+<source src="/2025/assets/videos/FWVGA/mp4/01.mp4"       type="video/mp4" media="(max-width: 854px)">
+<source src="/2025/assets/videos/qHD/mp4/01.mp4"         type="video/mp4" media="(max-width: 960px)">
+<source src="/2025/assets/videos/HD/mp4/01.mp4"          type="video/mp4" media="(max-width: 1280px)">
+<source src="/2025/assets/videos/HDplus/mp4/01.mp4"      type="video/mp4" media="(max-width: 1600px)">
+<source src="/2025/assets/videos/FullHD/mp4/01.mp4"      type="video/mp4" media="(max-width: 1920px)">
+<source src="/2025/assets/videos/1440p/mp4/01.mp4"       type="video/mp4" media="(max-width: 2560px)">
+<source src="/2025/assets/videos/4K/mp4/01.mp4"          type="video/mp4" media="(min-width: 2561px)">
       Dein Browser unterstützt dieses Videoformat nicht.
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