diff --git a/extensions/pagetop-aliner/src/lib.rs b/extensions/pagetop-aliner/src/lib.rs
index 5e915578..80e6ca15 100644
--- a/extensions/pagetop-aliner/src/lib.rs
+++ b/extensions/pagetop-aliner/src/lib.rs
@@ -105,15 +105,24 @@ impl Extension for Aliner {
 
 impl Theme for Aliner {
     fn before_render_page_body(&self, page: &mut Page) {
-        page.alter_param("include_basic_assets", true)
-            .alter_assets(ContextOp::AddStyleSheet(
-                StyleSheet::from("/aliner/css/styles.css")
-                    .with_version(env!("CARGO_PKG_VERSION"))
-                    .with_weight(-90),
-            ))
-            .alter_child_in(
-                Region::FOOTER,
-                ChildOp::AddIfEmpty(Child::with(PoweredBy::new())),
-            );
+        page.alter_assets(ContextOp::AddStyleSheet(
+            StyleSheet::from("/css/normalize.css")
+                .with_version("8.0.1")
+                .with_weight(-99),
+        ))
+        .alter_assets(ContextOp::AddStyleSheet(
+            StyleSheet::from("/css/basic.css")
+                .with_version(PAGETOP_VERSION)
+                .with_weight(-99),
+        ))
+        .alter_assets(ContextOp::AddStyleSheet(
+            StyleSheet::from("/aliner/css/styles.css")
+                .with_version(env!("CARGO_PKG_VERSION"))
+                .with_weight(-99),
+        ))
+        .alter_child_in(
+            Region::FOOTER,
+            ChildOp::AddIfEmpty(Child::with(PoweredBy::new())),
+        );
     }
 }
diff --git a/src/app.rs b/src/app.rs
index c8ffba11..6ecff369 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -6,7 +6,7 @@ use crate::core::{extension, extension::ExtensionRef};
 use crate::html::Markup;
 use crate::response::page::{ErrorPage, ResultPage};
 use crate::service::HttpRequest;
-use crate::{global, locale, service, trace};
+use crate::{global, locale, service, trace, PAGETOP_VERSION};
 
 use actix_session::config::{BrowserSession, PersistentSession, SessionLifecycle};
 use actix_session::storage::CookieSessionStore;
@@ -108,7 +108,7 @@ impl Application {
             println!(
                 "{} {}\n",
                 "Powered by PageTop".yellow(),
-                env!("CARGO_PKG_VERSION").yellow()
+                PAGETOP_VERSION.yellow()
             );
         }
     }
diff --git a/src/base/component/intro.rs b/src/base/component/intro.rs
index 5de7349a..ea01ccc8 100644
--- a/src/base/component/intro.rs
+++ b/src/base/component/intro.rs
@@ -105,7 +105,7 @@ impl Component for Intro {
 
     fn setup_before_prepare(&mut self, cx: &mut Context) {
         cx.alter_assets(ContextOp::AddStyleSheet(
-            StyleSheet::from("/css/intro.css").with_version(env!("CARGO_PKG_VERSION")),
+            StyleSheet::from("/css/intro.css").with_version(PAGETOP_VERSION),
         ));
     }
 
diff --git a/src/base/theme/basic.rs b/src/base/theme/basic.rs
index 63ebe7a3..83dc4a8d 100644
--- a/src/base/theme/basic.rs
+++ b/src/base/theme/basic.rs
@@ -12,10 +12,19 @@ impl Extension for Basic {
 
 impl Theme for Basic {
     fn before_render_page_body(&self, page: &mut Page) {
-        page.alter_param("include_basic_assets", true)
-            .alter_child_in(
-                Region::FOOTER,
-                ChildOp::AddIfEmpty(Child::with(PoweredBy::new())),
-            );
+        page.alter_assets(ContextOp::AddStyleSheet(
+            StyleSheet::from("/css/normalize.css")
+                .with_version("8.0.1")
+                .with_weight(-99),
+        ))
+        .alter_assets(ContextOp::AddStyleSheet(
+            StyleSheet::from("/css/basic.css")
+                .with_version(PAGETOP_VERSION)
+                .with_weight(-99),
+        ))
+        .alter_child_in(
+            Region::FOOTER,
+            ChildOp::AddIfEmpty(Child::with(PoweredBy::new())),
+        );
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index a2683495..caa74536 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -99,6 +99,40 @@ use std::ops::Deref;
 
 // **< RE-EXPORTED >********************************************************************************
 
+/// Versión del *crate* `pagetop`, obtenida en tiempo de compilación (`CARGO_PKG_VERSION`).
+///
+/// Útil para versionar recursos estáticos de PageTop desde otros *crates*. Por ejemplo:
+///
+/// ```rust
+/// use pagetop::prelude::*;
+///
+/// pub struct MyTheme;
+///
+/// impl Extension for MyTheme {
+///     fn theme(&self) -> Option<ThemeRef> {
+///         Some(&Self)
+///     }
+/// }
+///
+/// impl Theme for MyTheme {
+///     fn before_render_page_body(&self, page: &mut Page) {
+///         page
+///             .alter_assets(ContextOp::AddStyleSheet(
+///                 StyleSheet::from("/css/normalize.css").with_version("8.0.1"),
+///             ))
+///             .alter_assets(ContextOp::AddStyleSheet(
+///                 StyleSheet::from("/css/basic.css").with_version(PAGETOP_VERSION),
+///             ))
+///             .alter_assets(ContextOp::AddStyleSheet(
+///                 StyleSheet::from("/mytheme/styles.css").with_version(env!("CARGO_PKG_VERSION")),
+///             ));
+///     }
+/// }
+/// ```
+/// Donde `PAGETOP_VERSION` identifica la versión de PageTop y `env!("CARGO_PKG_VERSION")` hace
+/// referencia a la versión del *crate* que lo usa.
+pub const PAGETOP_VERSION: &str = env!("CARGO_PKG_VERSION");
+
 pub use pagetop_macros::{builder_fn, html, main, test, AutoDefault};
 
 pub use pagetop_statics::{resource, StaticResource};
diff --git a/src/prelude.rs b/src/prelude.rs
index 15121036..1d649fec 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -2,6 +2,8 @@
 
 // RE-EXPORTED.
 
+pub use crate::PAGETOP_VERSION;
+
 pub use crate::{builder_fn, html, main, test};
 
 pub use crate::{AutoDefault, StaticResources, UniqueId, Weight};