reduce printing font to keep code lines within bounds

public/css/custom.css

@@ -101,6 +101,10 @@ p:after {
         page-break-inside:avoid;
         page-break-before:avoid;
     }
+    pre code {
+        /* try to fit 100 max chars into one A4 line */
+        font-size: 2.8mm;
+    }
     h1,h2,h3,h4,h5,strong {
         page-break-after:avoid;
     }