Add multiple fonts

src/styles/_rail.scss

@@ -39,6 +39,9 @@
 	scrollbar-width: none;
 	display: flex;
 	flex-direction: column;
+	//The window is small and centred on where the reading is, so the current
+	//tab sits at eye level rather than wherever a full list would put it.
+	justify-content: center;
 	gap: 0.3rem;
 	padding: 0.15rem 0;
 
@@ -144,8 +147,8 @@
 	white-space: nowrap;
 }
 
-/* "Load older entries" sits at the top of the rail, since the rail is
- * chronological and the oldest entry is the first tab. */
+/* The rail shows a few tabs either side of where the reading is. These two
+ * say the book carries on past them, and walk the window along. */
 .rail__more {
 	flex: 0 0 auto;
 	align-self: flex-start;