diff --git a/04-chatgpt-local/.history/index_20240612184154.html b/04-chatgpt-local/.history/index_20240612184154.html
new file mode 100644
index 0000000..bd3e68b
--- /dev/null
+++ b/04-chatgpt-local/.history/index_20240612184154.html
@@ -0,0 +1,295 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>ChatGPT Local 100% privado, gratis y maravilloso</title>
+
+  <style>
+    body {
+      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
+      background: #f0f0f0;
+      display: grid;
+      place-content: center;
+      height: 100dvh;
+    }
+
+    main {
+      width: 400px;
+      max-width: 100%;
+      height: 70vh;
+
+      background: #fff;
+      border: 1px solid #ccc;
+      border-radius: 4px;
+      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
+      padding: 8px;
+      margin-bottom: 16px;
+
+      overflow-y: auto;
+      scroll-behavior: smooth;
+    }
+
+    ul {
+      display: flex;
+      flex-direction: column;
+      list-style: none;
+      padding: 0;
+    }
+
+    .message {
+      display: flex;
+      flex-direction: column;
+      margin: 4px 0;
+      padding: 4px 8px;
+
+      span {
+        width: 36px;
+        height: 36px;
+        background: #eee;
+        font-size: 12px;
+        font-weight: 500;
+        display: flex;
+        justify-content: center;
+        align-items: center;
+        border-radius: 999999px;
+      }
+
+      p {
+        border-radius: 4px;
+        padding: 4px 8px;
+        margin-top: 4px;
+      }
+
+      &.user {
+        align-self: flex-end;
+        align-items: flex-end;
+
+        span,
+        p {
+          background: rgb(219, 236, 255);
+        }
+      }
+
+      &.bot {
+        align-self: flex-start;
+
+        span,
+        p {
+          background: rgb(198, 255, 220);
+        }
+      }
+    }
+
+    form {
+      display: flex;
+
+      input {
+        border-radius: 999999px;
+        flex-grow: 1;
+        border: 0;
+        padding: 8px;
+        margin-right: 8px;
+        border: 1px solid #ccc;
+      }
+
+      button {
+        background: #09f;
+        border: 0;
+        color: white;
+        border-radius: 6px;
+        cursor: pointer;
+        padding: 8px;
+        transition: background .3s ease;
+
+        &[disabled] {
+          background: #ccc;
+          opacity: .6;
+          pointer-events: none;
+        }
+
+        &:hover {
+          background: rgb(0, 104, 173);
+        }
+      }
+    }
+
+    small {
+      font-size: 10px;
+      color: #555;
+      position: fixed;
+      bottom: 10px;
+      left: 0;
+      right: 0;
+      margin: auto;
+      width: 400px;
+    }
+
+    .loading {
+      text-align: center;
+      display: flex;
+      justify-content: center;
+      height: 100%;
+      align-items: center;
+      flex-direction: column;
+      margin-top: 50%;
+
+      i {
+        pointer-events: none;
+        width: 2.5em;
+        height: 2.5em;
+        border: 0.4em solid transparent;
+        border-color: #eee;
+        border-top-color: #3E67EC;
+        border-radius: 50%;
+        animation: loadingspin 1s linear infinite;
+      }
+
+      h4 {
+        color: #444;
+        margin-bottom: 8px;
+      }
+
+      h5 {
+        font-weight: 400;
+        margin: 0;
+        font-size: 10px;
+        opacity: .4;
+      }
+    }
+
+    @keyframes loadingspin {
+      100% {
+        transform: rotate(360deg)
+      }
+    }
+  </style>
+
+  <script type="module">
+    import { CreateWebWorkerMLCEngine } from "https://esm.run/@mlc-ai/web-llm"
+
+    const $ = el => document.querySelector(el)
+
+    // pongo delante de la variable un símbolo de $
+    // para indicar que es un elemento del DOM
+    const $form = $('form')
+    const $input = $('input')
+    const $template = $('#message-template')
+    const $messages = $('ul')
+    const $container = $('main')
+    const $button = $('button')
+    const $info = $('small')
+    const $loading = $('.loading')
+
+    let messages = []
+
+    const SELECTED_MODEL = 'Llama-3-8B-Instruct-q4f32_1-MLC-1k'
+
+    const engine = await CreateWebWorkerMLCEngine(
+      new Worker('./worker.js', { type: 'module' }),
+      SELECTED_MODEL,
+      {
+        initProgressCallback: (info) => {
+          $info.textContent = `${info.text}%`
+          if (info.progress === 1) {
+            $loading.parentNode.removeChild($loading)
+            $button.removeAttribute('disabled')
+            addMessage("¡Hola! Soy un ChatGPT que se ejecuta completamente en tu navegador. ¿En qué puedo ayudarte hoy?", 'bot')
+            $input.focus()
+          }
+        }
+      }
+    )
+
+    $form.addEventListener('submit', async (event) => {
+      event.preventDefault()
+      const messageText = $input.value.trim()
+
+      if (messageText !== '') {
+        // añadimos el mensaje en el DOM
+        $input.value = ''
+      }
+
+      addMessage(messageText, 'user')
+      $button.setAttribute('disabled', '')
+
+      const userMessage = {
+        role: 'user',
+        content: messageText
+      }
+
+      messages.push(userMessage)
+
+      const chunks = await engine.chat.completions.create({
+        messages,
+        stream: true
+      })
+
+      let reply = ""
+
+      const $botMessage = addMessage("", 'bot')
+
+      for await (const chunk of chunks) {
+        const choice = chunk.choices[0]
+        const content = choice?.delta?.content ?? ""
+        reply += content
+        $botMessage.textContent = reply
+      }
+
+      $button.removeAttribute('disabled')
+      messages.push({
+        role: 'assistant',
+        content: reply
+      })
+      $container.scrollTop = $container.scrollHeight
+    })
+
+    function addMessage(text, sender) {
+      // clonar el template
+      const clonedTemplate = $template.content.cloneNode(true)
+      const $newMessage = clonedTemplate.querySelector('.message')
+
+      const $who = $newMessage.querySelector('span')
+      const $text = $newMessage.querySelector('p')
+
+      $text.textContent = text
+      $who.textContent = sender === 'bot' ? 'GPT' : 'Tú'
+      $newMessage.classList.add(sender)
+
+      $messages.appendChild($newMessage)
+
+      $container.scrollTop = $container.scrollHeight
+
+      return $text
+    }
+  </script>
+</head>
+
+<body>
+  <main>
+    <ul>
+      <li class="loading">
+        <i></i>
+        <h4>Cargando...</h4>
+        <h5>Esto puede tardar un poco. Paciencia.</h5>
+      </li>
+    </ul>
+  </main>
+
+  <form>
+    <input placeholder="Escribe tu mensaje aquí...">
+    <button disabled>Enviar</button>
+  </form>
+
+  <small>&nbsp;</small>
+
+  <template id="message-template">
+    <li class="message">
+      <span></span>
+      <p></p>
+    </li>
+  </template>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/04-chatgpt-local/.history/index_20240612190429.html b/04-chatgpt-local/.history/index_20240612190429.html
new file mode 100644
index 0000000..c0d169a
--- /dev/null
+++ b/04-chatgpt-local/.history/index_20240612190429.html
@@ -0,0 +1,296 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>ChatGPT Local 100% privado, gratis y maravilloso</title>
+
+  <style>
+    body {
+      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
+      background: #f0f0f0;
+      display: grid;
+      place-content: center;
+      height: 100dvh;
+    }
+
+    main {
+      width: 400px;
+      max-width: 100%;
+      height: 70vh;
+
+      background: #fff;
+      border: 1px solid #ccc;
+      border-radius: 4px;
+      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
+      padding: 8px;
+      margin-bottom: 16px;
+
+      overflow-y: auto;
+      scroll-behavior: smooth;
+    }
+
+    ul {
+      display: flex;
+      flex-direction: column;
+      list-style: none;
+      padding: 0;
+    }
+
+    .message {
+      display: flex;
+      flex-direction: column;
+      margin: 4px 0;
+      padding: 4px 8px;
+
+      span {
+        width: 36px;
+        height: 36px;
+        background: #eee;
+        font-size: 12px;
+        font-weight: 500;
+        display: flex;
+        justify-content: center;
+        align-items: center;
+        border-radius: 999999px;
+      }
+
+      p {
+        border-radius: 4px;
+        padding: 4px 8px;
+        margin-top: 4px;
+      }
+
+      &.user {
+        align-self: flex-end;
+        align-items: flex-end;
+
+        span,
+        p {
+          background: rgb(219, 236, 255);
+        }
+      }
+
+      &.bot {
+        align-self: flex-start;
+
+        span,
+        p {
+          background: rgb(198, 255, 220);
+        }
+      }
+    }
+
+    form {
+      display: flex;
+
+      input {
+        border-radius: 999999px;
+        flex-grow: 1;
+        border: 0;
+        padding: 8px;
+        margin-right: 8px;
+        border: 1px solid #ccc;
+      }
+
+      button {
+        background: #09f;
+        border: 0;
+        color: white;
+        border-radius: 6px;
+        cursor: pointer;
+        padding: 8px;
+        transition: background .3s ease;
+
+        &[disabled] {
+          background: #ccc;
+          opacity: .6;
+          pointer-events: none;
+        }
+
+        &:hover {
+          background: rgb(0, 104, 173);
+        }
+      }
+    }
+
+    small {
+      font-size: 10px;
+      color: #555;
+      position: fixed;
+      bottom: 10px;
+      left: 0;
+      right: 0;
+      margin: auto;
+      width: 400px;
+    }
+
+    .loading {
+      text-align: center;
+      display: flex;
+      justify-content: center;
+      height: 100%;
+      align-items: center;
+      flex-direction: column;
+      margin-top: 50%;
+
+      i {
+        pointer-events: none;
+        width: 2.5em;
+        height: 2.5em;
+        border: 0.4em solid transparent;
+        border-color: #eee;
+        border-top-color: #3E67EC;
+        border-radius: 50%;
+        animation: loadingspin 1s linear infinite;
+      }
+
+      h4 {
+        color: #444;
+        margin-bottom: 8px;
+      }
+
+      h5 {
+        font-weight: 400;
+        margin: 0;
+        font-size: 10px;
+        opacity: .4;
+      }
+    }
+
+    @keyframes loadingspin {
+      100% {
+        transform: rotate(360deg)
+      }
+    }
+  </style>
+
+  <script type="module">
+    import { CreateWebWorkerMLCEngine } from "https://esm.run/@mlc-ai/web-llm"
+
+    const $ = el => document.querySelector(el)
+
+    // pongo delante de la variable un símbolo de $
+    // para indicar que es un elemento del DOM
+    const $form = $('form')
+    const $input = $('input')
+    const $template = $('#message-template')
+    const $messages = $('ul')
+    const $container = $('main')
+    const $button = $('button')
+    const $info = $('small')
+    const $loading = $('.loading')
+
+    let messages = []
+
+    const SELECTED_MODEL = 'Llama-3-8B-Instruct-q4f32_1-MLC-1k'
+
+    const engine = await CreateWebWorkerMLCEngine(
+      new Worker('./worker.js', { type: 'module' }),
+      SELECTED_MODEL,
+      {
+        initProgressCallback: (info) => {
+          $info.textContent = `${info.text}%`
+          if (info.progress === 1) {
+            $loading.parentNode.removeChild($loading)
+            $button.removeAttribute('disabled')
+            addMessage("¡Hola! Soy un ChatGPT que se ejecuta completamente en tu navegador. ¿En qué puedo ayudarte hoy?", 'bot')
+            $input.focus()
+          }
+        }
+      }
+    )
+
+    $form.addEventListener('submit', async (event) => {
+      event.preventDefault()
+      const messageText = $input.value.trim()
+
+      if (messageText !== '') {
+        // añadimos el mensaje en el DOM
+        $input.value = ''
+      }
+
+      addMessage(messageText, 'user')
+      $button.setAttribute('disabled', '')
+
+      const userMessage = {
+        role: 'user',
+        content: messageText
+      }
+
+      messages.push(userMessage)
+
+      const chunks = await engine.chat.completions.create({
+        messages,
+        stream: true
+      })
+
+      let reply = ""
+
+      const $botMessage = addMessage("", 'bot')
+
+      for await (const chunk of chunks) {
+        const choice = chunk.choices[0]
+        const content = choice?.delta?.content ?? ""
+        reply += content
+        $botMessage.textContent = reply
+        $container.scrollTop = $container.scrollHeight
+      }
+
+      $button.removeAttribute('disabled')
+      messages.push({
+        role: 'assistant',
+        content: reply
+      })
+      
+    })
+
+    function addMessage(text, sender) {
+      // clonar el template
+      const clonedTemplate = $template.content.cloneNode(true)
+      const $newMessage = clonedTemplate.querySelector('.message')
+
+      const $who = $newMessage.querySelector('span')
+      const $text = $newMessage.querySelector('p')
+
+      $text.textContent = text
+      $who.textContent = sender === 'bot' ? 'GPT' : 'Tú'
+      $newMessage.classList.add(sender)
+
+      $messages.appendChild($newMessage)
+
+      $container.scrollTop = $container.scrollHeight
+
+      return $text
+    }
+  </script>
+</head>
+
+<body>
+  <main>
+    <ul>
+      <li class="loading">
+        <i></i>
+        <h4>Cargando...</h4>
+        <h5>Esto puede tardar un poco. Paciencia.</h5>
+      </li>
+    </ul>
+  </main>
+
+  <form>
+    <input placeholder="Escribe tu mensaje aquí...">
+    <button disabled>Enviar</button>
+  </form>
+
+  <small>&nbsp;</small>
+
+  <template id="message-template">
+    <li class="message">
+      <span></span>
+      <p></p>
+    </li>
+  </template>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/04-chatgpt-local/index.html b/04-chatgpt-local/index.html
index bd3e68b..c0d169a 100644
--- a/04-chatgpt-local/index.html
+++ b/04-chatgpt-local/index.html
@@ -235,6 +235,7 @@
         const content = choice?.delta?.content ?? ""
         reply += content
         $botMessage.textContent = reply
+        $container.scrollTop = $container.scrollHeight
       }
 
       $button.removeAttribute('disabled')
@@ -242,7 +243,7 @@
         role: 'assistant',
         content: reply
       })
-      $container.scrollTop = $container.scrollHeight
+      
     })
 
     function addMessage(text, sender) {
