make it screenshot the screen of the user screen they shared when they press enter because right now when I press enter there is no screenshot: <!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Image Analyzer Chat</title>
  <style>
    /* General Styling */
    body, html {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
      margin: 0;
      padding: 0;
      height: 100%;
      background-color: #ffffff;
      color: #37352f;
    }
    .container {
      display: flex;
      height: 100%;
    }
    .sidebar {
      width: 240px;
      background-color: #fbfbfa;
      padding: 14px;
      box-shadow: inset -1px 0 0 rgba(0, 0, 0, 0.05);
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .sidebar .logo {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 30px;
      text-align: center;
    }
    .menu-item {
      padding: 10px;
      cursor: pointer;
      border-radius: 5px;
      transition: background-color 0.2s;
      user-select: none;
      font-size: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .menu-item:hover {
      background-color: rgba(55, 53, 47, 0.1);
    }
    .menu-item.active {
      background-color: rgba(55, 53, 47, 0.15);
    }
    .content {
      flex-grow: 1;
      padding: 40px 60px;
      overflow-y: auto;
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
    }
    h1 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    p {
      font-size: 16px;
      line-height: 1.5;
      color: #37352f;
      margin-bottom: 24px;
    }
    #chat-container {
      flex-grow: 1;
      overflow-y: auto;
      margin-bottom: 20px;
      padding-right: 10px;
    }
    .chat-message {
      margin-bottom: 15px;
      padding: 12px 16px;
      border-radius: 8px;
      max-width: 80%;
      word-wrap: break-word;
      box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }
    .user-message {
      background-color: #e6f3ff;
      align-self: flex-end;
    }
    .ai-message {
      background-color: #f0f0f0;
      align-self: flex-start;
    }
    #user-input {
      width: 100%;
      padding: 12px 16px;
      font-size: 16px;
      border: 1px solid #ccc;
      border-radius: 8px;
      margin-bottom: 10px;
      box-sizing: border-box;
    }
    #send-btn {
      padding: 12px 24px;
      font-size: 16px;
      background-color: #007bff;
      color: white;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: background-color 0.2s;
    }
    #send-btn:hover {
      background-color: #0056b3;
    }
    #images {
      margin-top: 40px;
    }
    #images h2 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .screenshot {
      margin-bottom: 20px;
      border: 1px solid rgba(55, 53, 47, 0.16);
      padding: 12px;
      border-radius: 8px;
      background-color: #fbfbfa;
    }
    .screenshot img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: 5px;
    }
    #share-screen-btn {
      padding: 10px 14px;
      cursor: pointer;
      border-radius: 5px;
      transition: background-color 0.2s;
      user-select: none;
      background-color: #fbfbfa;
      color: #37352f;
      text-align: center;
      font-size: 16px;
      border: 1px solid #ccc;
      width: 100%;
      margin-top: auto;
    }
    #share-screen-btn:hover {
      background-color: rgba(55, 53, 47, 0.08);
    }
    #share-screen-btn.active {
      background-color: rgba(55, 53, 47, 0.15);
    }
    .image-tab {
      display: flex;
      align-items: center;
      padding: 10px 14px;
      cursor: pointer;
      border-radius: 5px;
      transition: background-color 0.2s;
      user-select: none;
      font-size: 16px;
      background-color: #fbfbfa;
      border: 1px solid #ccc;
    }
    .image-tab:hover {
      background-color: rgba(55, 53, 47, 0.08);
    }
    .image-tab .star-icon {
      margin-right: 8px;
      color: gold;
      font-size: 18px;
    }
    .loader {
      border: 4px solid #f3f3f3;
      border-top: 4px solid #37352f;
      border-radius: 50%;
      width: 24px;
      height: 24px;
      animation: spin 1s linear infinite;
      display: inline-block;
      vertical-align: middle;
      margin-left: 10px;
    }
    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    /* Scrollbar Styling */
    ::-webkit-scrollbar {
      width: 8px;
    }
    ::-webkit-scrollbar-track {
      background: #f1f1f1;
    }
    ::-webkit-scrollbar-thumb {
      background: #c1c1c1;
      border-radius: 4px;
    }
    ::-webkit-scrollbar-thumb:hover {
      background: #a8a8a8;
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="sidebar">
      <div class="logo">Image Analyzer Chat</div>
      <div class="image-tab">
        <span class="star-icon">★</span>
        Images
      </div>
      <button id="share-screen-btn">Share Screen</button>
    </div>
    <div class="content">
      <h1>Image Analysis Chat</h1>
      <p>
        Share your screen and ask questions about the images you see. The AI will analyze the image based on your question and provide answers.
      </p>
      <div id="chat-container"></div>
      <input type="text" id="user-input" placeholder="Ask a question about the image...">
      <button id="send-btn">Send</button>
      
      <div id="images">
        <h2>Captured Image</h2>
        <!-- Screenshot will be appended here -->
      </div>
      
      <!-- Hidden Video Element to Capture Shared Screen -->
      <video id="shared-screen-video" autoplay style="display: none;"></video>
    </div>
  </div>

  <script>
    // Replace with your actual API key
    const GEMINI_API_KEY = 'YOUR_GEMINI_API_KEY_HERE';
    const GEMINI_API_URL = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent';

    let sharedStream = null;
    const videoElement = document.getElementById('shared-screen-video');
    let lastCapturedImage = null;

    function shareScreen() {
      if (sharedStream) {
        stopScreenSharing();
        return;
      }

      navigator.mediaDevices.getDisplayMedia({ video: true })
      .then(stream => {
        sharedStream = stream;
        videoElement.srcObject = stream;

        stream.getVideoTracks()[0].addEventListener('ended', () => {
          stopScreenSharing();
        });

        const shareBtn = document.getElementById('share-screen-btn');
        shareBtn.classList.add('active');
        shareBtn.innerText = 'Stop Sharing';

        captureScreenshot();
        console.log('Screen sharing started');
      })
      .catch(error => {
        console.error('Error sharing screen:', error);
        alert('Error sharing screen: ' + error.message);
      });
    }

    function stopScreenSharing() {
      if (sharedStream) {
        sharedStream.getTracks().forEach(track => track.stop());
        sharedStream = null;
        videoElement.srcObject = null;

        const shareBtn = document.getElementById('share-screen-btn');
        shareBtn.classList.remove('active');
        shareBtn.innerText = 'Share Screen';

        console.log('Screen sharing stopped');
      }
    }

    function captureScreenshot() {
      if (!sharedStream) {
        alert('Please share your screen first by clicking the "Share Screen" button.');
        return;
      }

      const video = document.getElementById('shared-screen-video');
      const canvas = document.createElement('canvas');
      canvas.width = video.videoWidth;
      canvas.height = video.videoHeight;
      const ctx = canvas.getContext('2d');

      ctx.drawImage(video, 0, 0, canvas.width, canvas.height);

      canvas.toBlob(blob => {
        const imgURL = URL.createObjectURL(blob);
        lastCapturedImage = blob;

        const screenshotDiv = document.createElement('div');
        screenshotDiv.classList.add('screenshot');

        const imgElement = document.createElement('img');
        imgElement.src = imgURL;
        imgElement.alt = 'Captured screenshot';

        screenshotDiv.appendChild(imgElement);

        const imagesSection = document.getElementById('images');
        imagesSection.innerHTML = '<h2>Captured Image</h2>'; // Reset with header
        imagesSection.appendChild(screenshotDiv);

        console.log('Screenshot captured and added to Images section');

        imgElement.onload = () => {
          URL.revokeObjectURL(imgURL);
        };
      }, 'image/png');
    }

    async function analyzeImage(question) {
      if (!lastCapturedImage) {
        addMessageToChat('AI', 'No image captured. Please share your screen and try again.');
        return;
      }

      const base64Image = await blobToBase64(lastCapturedImage);

      const requestBody = {
        prompt: `Answer this question about the image: ${question}`,
        images: [{
          data: base64Image.split(',')[1],
          mime_type: "image/png"
        }]
      };

      try {
        // Display loader
        const loadingMessage = addMessageToChat('AI', 'Analyzing image...', true);

        const response = await fetch(`${GEMINI_API_URL}?key=${GEMINI_API_KEY}`, {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json'
          },
          body: JSON.stringify(requestBody)
        });

        // Remove loader
        removeMessageFromChat(loadingMessage);

        if (!response.ok) {
          const errorText = await response.text();
          throw new Error(`Gemini API error: ${response.status} - ${errorText}`);
        }

        const data = await response.json();
        if (data.candidates && data.candidates[0].content && data.candidates[0].content) {
          const aiResponse = data.candidates[0].content;
          addMessageToChat('AI', aiResponse);
        } else {
          throw new Error('Unexpected response structure from Gemini API');
        }
      } catch (error) {
        console.error('Error analyzing image with Gemini:', error);
        addMessageToChat('AI', 'An error occurred while analyzing the image.');
      }
    }

    function blobToBase64(blob) {
      return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onloadend = () => resolve(reader.result);
        reader.onerror = reject;
        reader.readAsDataURL(blob);
      });
    }

    function addMessageToChat(sender, message, isLoading = false) {
      const chatContainer = document.getElementById('chat-container');
      const messageElement = document.createElement('div');
      messageElement.classList.add('chat-message', sender.toLowerCase() + '-message');
      messageElement.textContent = message;

      if (isLoading) {
        const loader = document.createElement('div');
        loader.classList.add('loader');
        messageElement.appendChild(loader);
      }

      chatContainer.appendChild(messageElement);
      chatContainer.scrollTop = chatContainer.scrollHeight;

      return messageElement;
    }

    function removeMessageFromChat(messageElement) {
      if (messageElement && messageElement.parentNode) {
        messageElement.parentNode.removeChild(messageElement);
      }
    }

    document.getElementById('send-btn').addEventListener('click', () => {
      const userInput = document.getElementById('user-input');
      const question = userInput.value.trim();
      if (question) {
        addMessageToChat('User', question);
        analyzeImage(question);
        userInput.value = '';
      }
    });

    document.getElementById('user-input').addEventListener('keypress', (e) => {
      if (e.key === 'Enter') {
        document.getElementById('send-btn').click();
      }
    });

    document.getElementById('share-screen-btn').addEventListener('click', shareScreen);
  </script>
</body>
</html> fix that up, now write the full code