diff --git a/theme/classic/scss/moodle.scss b/theme/classic/scss/moodle.scss
index 6f08f9ef1eb..705f0c08e55 100644
--- a/theme/classic/scss/moodle.scss
+++ b/theme/classic/scss/moodle.scss
@@ -18,6 +18,21 @@ img.userpicture {
     }
 }
 
+.path-mod-book {
+    #mod_book-chaptersnavigation {
+        margin-left: -5px;
+        margin-right: -5px;
+
+        @include media-breakpoint-down(md) {
+            top: calc(100% - 150px);
+        }
+    }
+
+    .book_content {
+        margin: 0 30px;
+    }
+}
+
 .tertiary-navigation {
 
     &.full-width-bottom-border {