diff --git a/ora3/book/book.css b/ora3/book/book.css
index a1677ef..2f54f9a 100644
--- a/ora3/book/book.css
+++ b/ora3/book/book.css
@@ -10,6 +10,7 @@ para {
 
 book {
     background-color: #f8f8f8;
+    counter-reset: chapter-number footnote-number;
     font-family: "EB Garamond", Garamond, Georgia, 'Times New Roman', Times, serif;
     margin: auto;
     max-width: 80ch;
@@ -40,3 +41,60 @@ book>title {
 title+chapter {
     border-top: medium double black;
 }
+
+chapter>title {
+    font-size: x-large;
+    text-decoration: underline;
+    margin: 1.5em 0 0.75em 0;
+}
+
+chapter>title::before {
+    content: "Chapter " counter(chapter-number) "\2014";
+    counter-increment: chapter-number;
+}
+
+para {
+    line-height: 1.5;
+    margin-top: 0.75em;
+    text-indent: 1.5em;
+}
+
+title+para {
+    text-indent: 0;
+}
+
+title+para::first-letter {
+    font-size: 1.7em;
+    font-weight: bold;
+    line-height: 1;
+    margin-right: 0.05em;
+}
+
+para:hover {
+    background-color: slateblue;
+    color: white;
+    cursor: pointer;
+}
+
+footnote {
+    display: inline;
+    font-size: 0;
+    vertical-align: super;
+}
+
+footnote::before {
+    content: '[' counter(footnote-number) ']';
+    counter-increment: footnote-number;
+    font-size: small;
+}
+
+footnote:hover {
+    background-color: tomato;
+    font-size: large;
+    padding: 0.5em;
+}
+
+footnote:hover::before {
+    font-size: large;
+    padding-right: 0.25em;
+}