Improve docs

doc/fmt.css

@@ -1,5 +1,5 @@
 :root {
-  --md-primary-fg-color: #0065C9;
+  --md-primary-fg-color: #0050D0;
 }
 
 .md-grid {
@@ -14,6 +14,10 @@
   margin-left: 1em;
 }
 
+pre > code.decl {
+  white-space: pre-wrap;
+}
+
 .features-container {
   display: flex;
   flex-wrap: wrap;

doc/index.md

@@ -105,7 +105,7 @@ hide:
   per-call binary code</b>. For example, a call to <code>fmt::print</code> with
   a single argument is fewer than <a href="https://godbolt.org/g/TZU4KF">ten
   x86-64 instructions</a>, comparable to <code>printf</code> despite adding
-  runtime safety and much smaller than the equivalent iostreams code.
+  runtime safety, and much smaller than the equivalent iostreams code.
 </p>
 <p>
   The library itself has small binary footprint and some components such as