Image width reduced for better viewing in case of small ones

hdoc_to_pdf/css/main.css

@@ -188,7 +188,7 @@ p.authors {
 img {
   display: block;
   position: relative;
-  width: 10cm;
+  width: 80mm;
   margin: auto;
   padding-top: 5mm;
   padding-bottom: 5mm;