diff --git a/markdown/media/presentationsourceqr.svg b/markdown/media/presentationsourceqr.svg
index 0b660d6..be5b7c8 100644
--- a/markdown/media/presentationsourceqr.svg
+++ b/markdown/media/presentationsourceqr.svg
@@ -1,7 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- Created with qrencode 4.1.1 (https://fukuchi.org/works/qrencode/index.html) -->
 <svg width="5.1837cm" height="5.1837cm" preserveAspectRatio="none" version="1.1" viewBox="0 0 49 49" xmlns="http://www.w3.org/2000/svg">
- <g id="QRcode" transform="translate(-4,-4)">
+ <defs>
+  <filter id="filter1251" x="0" y="0" width="1" height="1" color-interpolation-filters="sRGB">
+   <feColorMatrix result="color1" type="hueRotate" values="180"/>
+   <feColorMatrix result="color2" values="-1 0 0 0 1 0 -1 0 0 1 0 0 -1 0 1 -0.21 -0.72 -0.07 2 0 "/>
+  </filter>
+ </defs>
+ <g id="QRcode" transform="translate(-4,-4)" filter="url(#filter1251)">
   <g id="Pattern" transform="translate(4,4)">
    <rect width="1" height="1"/>
    <rect x="1" width="1" height="1"/>