X-Git-Url: https://git.arvados.org/rnaseq-cwl-training.git/blobdiff_plain/7a498a2c54e0bd1b1f7cdb5ff59fb547566f44ea..a7a0009abd62fb895008ce47406b6fb371204e27:/lesson.css?ds=sidebyside

diff --git a/lesson.css b/lesson.css
index 64ee952..9d28880 100644
--- a/lesson.css
+++ b/lesson.css
@@ -70,7 +70,9 @@ div.box {
 
 /* Challenge questions. */
 div.challenge {
-    background-color: lightblue;
+    border-style: solid;
+    border-width: thin;
+    border-color: gray;
 }
 
 /* Key points in summary. */