Improve style

doc/cppformat.less

@@ -57,3 +57,8 @@ div.sphinxsidebar {
 .class dd, .define dd, .function dd {
   margin-left: 30px;
 }
+
+// Remove Bootstrap padding for code elements in API signatures.
+.descclassname, .descname {
+  padding: 0;
+}