diff --git a/js/section-types.js b/js/section-types.js
index 704095f..2218b96 100644
--- a/js/section-types.js
+++ b/js/section-types.js
@@ -45,7 +45,7 @@ function addGroupSection(data, children = [], container = sectionsContainer) {
   // Marcado con la clase 'group-container' para que el resto de este
   // módulo pueda reconocer que esta sección es un grupo.
   const groupContainer = document.createElement('div');
-  groupContainer.className = 'group-container flex flex-col gap-4 border-l-2 border-base-300';
+  groupContainer.className = 'group-container flex flex-col gap-4';
 
   const toolbar = document.createElement('div');
   toolbar.className = 'flex flex-wrap gap-2 mb-4';
@@ -101,7 +101,7 @@ const SECTION_TYPES = [
     // bloque aparte, con una guía visual a la izquierda.
     render: (section, groupContainer, target) => {
       const wrapper = document.createElement('div');
-      wrapper.className = 'border-l-2 border-base-300 my-2 flex flex-col gap-1';
+      wrapper.className = 'my-2 flex flex-col gap-1';
       Array.from(groupContainer.children).forEach(child => renderOutputSection(child, wrapper));
       if (wrapper.children.length) target.appendChild(wrapper);
     },