diff --git a/public/mod/book/styles.css b/public/mod/book/styles.css
index bff952db56c..009cb151801 100644
--- a/public/mod/book/styles.css
+++ b/public/mod/book/styles.css
@@ -61,7 +61,7 @@
 }
 
 .path-mod-book .book_content {
-    margin: 0 5px;
+    margin: 0 15px;
     padding-right: 15px;
     padding-left: 15px;
     position: relative; /* Chapter navigation should not float on top of content. */
diff --git a/public/theme/classic/scss/moodle.scss b/public/theme/classic/scss/moodle.scss
index 1966680c1c9..de782af5e67 100644
--- a/public/theme/classic/scss/moodle.scss
+++ b/public/theme/classic/scss/moodle.scss
@@ -32,7 +32,7 @@ img.userpicture {
     }
 
     .book_content {
-        margin: 0 30px;
+        margin: 0 40px;
 
         @include media-breakpoint-down(md) {
             margin-left: -10px;