diff --git a/_sass/base.scss b/_sass/base.scss
index 02fd92c..200acd0 100644
--- a/_sass/base.scss
+++ b/_sass/base.scss
@@ -26,6 +26,10 @@ ol ol, ul ol {
   list-style-type: lower-roman;
 }
 
+ul ul ol, ul ol ol, ol ul ol, ol ol ol {
+  list-style-type: lower-alpha;
+}
+
 .content {
   margin-top: 80px;
 }