Revise examples a little bit.

examples/biteme.lol.cpp

@@ -15,10 +15,8 @@ int main() {
 
     html.push_back({"title", {}, "Google"});
 
-    docpp::CSS::Stylesheet sheet{};
-
-    sheet.push_back(docpp::CSS::Element(
-        ".center", {
+    docpp::CSS::Stylesheet sheet{{
+        {".center", {
             {"display", "flex"},
             {"flex-wrap", "wrap"},
             {"justify-content", "center"},
@@ -26,14 +24,11 @@ int main() {
             {"font-size", "10vw"},
             {"height", "10vw"},
             {"padding", "10vw"},
-        }
-    ));
-
-    sheet.push_back(docpp::CSS::Element(
-        "input[type=text], select", {
+        }},
+        {"input[type=text], select", {
             {"width", "50vw"},
-        }
-    ));
+        }},
+    }};
 
     html.push_back({"style", {}, sheet.get(docpp::CSS::FORMATTING_PRETTY)});
 

examples/hello-world.cpp

@@ -28,7 +28,7 @@ int main() {
      *
      * Note that it is very important that you do not append a section or element to a section until you have finished its construction,
      * because push_back() makes a copy of the object you pass to it. If you need to make changes later, you can use methods such as find() and swap(),
-     * or construct a new object.
+     * or construct a new object. An alternative is to append using the += operator, which does the same thing as push_back().
      *
      * To get the section as an std::string object, call section.get().
      */