diff --git a/docs/Computer-aided Design.md b/docs/Computer-aided Design.md
index 6227a66cba649001711703e994f7aa0419ba128c..da701c3db264b6b4b3d41c6d292599bac92d75ab 100644
--- a/docs/Computer-aided Design.md	
+++ b/docs/Computer-aided Design.md	
@@ -119,3 +119,5 @@ This week, for 2D design I'm not yet sure what benefits softwares like GIMP and
 [GIMP explorations](./images/cad/gimp.zip)  
 [Blender trials](./images/cad/blender.zip)  
 [Different fusion trials](./images/cad/fusion.zip)
+
+![render-diagram](./images/cad/render.jpg)  
diff --git a/docs/images/cad/render.jpg b/docs/images/cad/render.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..e7db9485cbcda6295f375cda9789bc3defeb80a1
Binary files /dev/null and b/docs/images/cad/render.jpg differ
diff --git a/docs/images/iiip/business-model.jpg b/docs/images/iiip/business-model.jpg
index 4d633d1cdf88521f2070c523073a1f41faa80df6..8b887e75295b25df6e35d6c0a3cb4dbe30d5c66c 100644
Binary files a/docs/images/iiip/business-model.jpg and b/docs/images/iiip/business-model.jpg differ
diff --git a/docs/stylesheets/extra.css b/docs/stylesheets/extra.css
index 36e518f8bf4a2da5d2e6df24f2026daaefbc9259..f04dc6315a6ff379c72c3572c9f7e522c7a2b27e 100644
--- a/docs/stylesheets/extra.css
+++ b/docs/stylesheets/extra.css
@@ -8,4 +8,4 @@
   src: "./assets/HelveticaNeue.ttc";
 }
 
-body { font-weight: light; }
+body { font-weight: lighter; }