diff --git a/style.css b/style.css
index 1b6497e..ad36494 100644
--- a/style.css
+++ b/style.css
@@ -706,3 +706,19 @@ ol li ol li ol {
 .block[data-taxon="Solution"] {
     background-color: rgba(255, 255, 255, 0.64);
 }
+
+kbd {
+  background-color: #eee;
+  border-radius: 3px;
+  border: 1px solid #b4b4b4;
+  box-shadow:
+    0 1px 1px rgba(0, 0, 0, 0.2),
+    0 2px 0 0 rgba(255, 255, 255, 0.7) inset;
+  color: #333;
+  display: inline-block;
+  font-size: 0.85em;
+  font-weight: 700;
+  line-height: 1;
+  padding: 2px 4px;
+  white-space: nowrap;
+}