Fix width of qr code caption box again

Change-Id: I7d1cd0ae612b5f32c85cdbabd0c45a8791294a58
diff --git a/inst/rmarkdown/templates/posterdown_ids/resources/template.html b/inst/rmarkdown/templates/posterdown_ids/resources/template.html
index f0159b7..e7728b0 100644
--- a/inst/rmarkdown/templates/posterdown_ids/resources/template.html
+++ b/inst/rmarkdown/templates/posterdown_ids/resources/template.html
@@ -323,7 +323,7 @@
   line-height: 1.25;
   color: #444444;
   margin-left: 0;
-  max-width: 7.5cm;
+  max-width: 12cm;
   word-wrap: break-word;
 }