diff --git a/assets/sass/book2.scss b/assets/sass/book2.scss
index ac41e374f8..41fcd6e5db 100644
--- a/assets/sass/book2.scss
+++ b/assets/sass/book2.scss
@@ -38,7 +38,7 @@
   /* frontmatter */
 
   section[data-type="titlepage"] h1 {
-    font-family: serif;
+    font-family: sans-serif;
   }
 
   section[data-type="titlepage"] h2,
@@ -110,7 +110,7 @@
 
   section[data-type="dedication"] {
     padding-top: 100px;
-    font-family: serif;
+    font-family: sans-serif;
     font-style: italic;
     page-break-after: always;
     text-align: center;
@@ -234,7 +234,7 @@
   section[data-type="chapter"] > h1,
   section[data-type="appendix"] > h1,
   section[data-type="sect1"] h1 {
-    font-family: serif;
+    font-family: sans-serif;
     line-height: 120%;
   }
 
@@ -396,7 +396,7 @@
 
   figcaption {
     display: block;
-    font-family: serif;
+    font-family: sans-serif;
     font-size: 1em;
     font-style: italic;
     line-height: 120%;
@@ -429,7 +429,7 @@
 
   aside p { /* sidebar text */
     margin-top: 6px;
-    font-family: serif;
+    font-family: sans-serif;
     font-size: 1em;
     line-height: 130%;
     text-indent: 0;
@@ -460,7 +460,7 @@
 
   div[data-type="note"] p,
   div[data-type="warning"] p { /* admonition text */
-    font-family: serif;
+    font-family: sans-serif;
     font-size: 1em;
     line-height: 120%;
     text-indent: 0;