diff --git a/inbox.html b/inbox.html
index 73413c2..1c68e0f 100644
--- a/inbox.html
+++ b/inbox.html
@@ -3,17 +3,43 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Inbox - Bang Webmail</title>
+  <title>Inbox - bang</title>
   <link rel="stylesheet" href="style.css">
 </head>
 <body>
-  <div class="container">
-    <h2>Inbox</h2>
-    <button onclick="logout()">Logout</button>
-    <button onclick="location.href='send.html'">Compose</button>
-    <div id="inboxList"></div>
-    <p id="inboxError" class="error"></p>
+  <div class="layout">
+    <aside class="sidebar">
+      <h2>bang</h2>
+      <nav>
+        <ul>
+          <li><button id="sidebar-inbox" class="sidebar-btn active">Inbox</button></li>
+          <li><button id="sidebar-sent" class="sidebar-btn">Sent</button></li>
+        </ul>
+      </nav>
+      <button class="compose-btn" id="openComposeBtn">Compose</button>
+      <button class="logout-btn" onclick="logout()">Logout</button>
+    </aside>
+    <main class="main-content">
+      <div id="email-list"></div>
+      <div id="email-detail" class="email-detail"></div>
+      <p id="inboxError" class="error"></p>
+    </main>
   </div>
+
+  <div id="composeOverlay" class="modal-overlay" style="display:none;">
+    <div class="modal-content">
+      <h2>Compose Email</h2>
+      <form id="composeForm">
+        <input type="text" id="composeTo" placeholder="To (person!place.com)" required><br>
+        <input type="text" id="composeSubject" placeholder="Subject" required><br>
+        <textarea id="composeBody" placeholder="Message" required></textarea><br>
+        <button type="submit">Send</button>
+        <button type="button" id="closeComposeBtn">Cancel</button>
+      </form>
+      <p id="composeError" class="error"></p>
+    </div>
+  </div>
+
   <script src="main.js"></script>
 </body>
 </html>
diff --git a/index.html b/index.html
index da3a2b5..d070851 100644
--- a/index.html
+++ b/index.html
@@ -3,17 +3,17 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Bang Webmail</title>
+  <title>bang</title>
   <link rel="stylesheet" href="style.css">
 </head>
 <body>
   <div class="container">
-    <h1>Bang Webmail</h1>
+    <h1>bang</h1>
     <nav>
       <a href="login.html">Login</a>
       <a href="register.html">Register</a>
     </nav>
-    <p>Welcome to Bang Webmail! Please login or register to continue.</p>
+    <p>Send emails with a !</p>
   </div>
 </body>
 </html>
diff --git a/main.js b/main.js
index 95bfbb7..053621c 100644
--- a/main.js
+++ b/main.js
@@ -59,7 +59,7 @@ if (document.getElementById('loginForm')) {
 }
 
 // Inbox
-if (document.getElementById('inboxList')) {
+if (document.getElementById('email-list')) {
   const { username, password } = getCredentials();
   if (!username || !password) {
     window.location.href = 'login.html';
@@ -70,8 +70,6 @@ if (document.getElementById('inboxList')) {
       .then(res => res.json())
       .then(emails => {
         if (!Array.isArray(emails)) throw new Error('Invalid mailbox response');
-        // Determine current user's full address (username!domain if possible)
-        // Try to find domain from any received or sent email
         let userDomain = null;
         for (const email of emails) {
           if (email.to === username && email.domain) {
@@ -84,50 +82,85 @@ if (document.getElementById('inboxList')) {
           }
         }
         const userFull = userDomain ? `${username}!${userDomain}` : username;
-        // Inbox: emails where 'to!domain' matches current user
         const inboxEmails = emails.filter(email => {
           if (!email.to) return false;
           const toFull = email.domain ? `${email.to}!${email.domain}` : email.to;
           return toFull === userFull;
         });
-        // Sent: emails where 'from!domain' matches current user
         const sentEmails = emails.filter(email => {
           if (!email.from) return false;
           const fromFull = email.domain ? `${email.from}!${email.domain}` : email.from;
           return fromFull === userFull;
         });
-        let html = '';
-        html += '<h3>Inbox</h3>';
-        if (inboxEmails.length === 0) {
-          html += '<p>No emails.</p>';
-        } else {
-          html += inboxEmails.map(email => {
-            const fromDisplay = email.domain ? `${email.from}!${email.domain}` : email.from;
-            return `
-              <div class="email-item">
-                <strong>From:</strong> ${fromDisplay}<br>
-                <strong>Subject:</strong> ${email.subject}<br>
-                <div>${email.body}</div>
-              </div>
-            `;
-          }).join('');
+        let currentFolder = 'inbox';
+        let selectedEmail = null;
+        function renderList() {
+          const list = currentFolder === 'inbox' ? inboxEmails : sentEmails;
+          let html = `<div class="email-list-section"><div class="email-list-title">${currentFolder === 'inbox' ? 'Inbox' : 'Sent'}</div>`;
+          if (list.length === 0) {
+            html += '<p>No emails.</p>';
+          } else {
+            html += list.map((email, idx) => {
+              const display = currentFolder === 'inbox'
+                ? (email.domain ? `${email.from}!${email.domain}` : email.from)
+                : (email.domain ? `${email.to}!${email.domain}` : email.to);
+              const fromto = currentFolder === 'inbox' ? `From: ${display}` : `To: ${display}`;
+              return `<div class="email-list-item${selectedEmail === idx ? ' selected' : ''}" data-idx="${idx}">
+                <div class="subject">${email.subject}</div>
+                <div class="fromto">${fromto}</div>
+              </div>`;
+            }).join('');
+          }
+          html += '</div>';
+          document.getElementById('email-list').innerHTML = html;
+          // Add click listeners
+          document.querySelectorAll('.email-list-item').forEach(item => {
+            item.onclick = function() {
+              selectedEmail = parseInt(this.getAttribute('data-idx'));
+              renderList();
+              renderDetail();
+            };
+          });
         }
-        html += '<h3>Sent</h3>';
-        if (sentEmails.length === 0) {
-          html += '<p>No sent emails.</p>';
-        } else {
-          html += sentEmails.map(email => {
-            const toDisplay = email.domain ? `${email.to}!${email.domain}` : email.to;
-            return `
-              <div class="email-item">
-                <strong>To:</strong> ${toDisplay}<br>
-                <strong>Subject:</strong> ${email.subject}<br>
-                <div>${email.body}</div>
+        function renderDetail() {
+          const list = currentFolder === 'inbox' ? inboxEmails : sentEmails;
+          if (selectedEmail == null || !list[selectedEmail]) {
+            document.getElementById('email-detail').innerHTML = '';
+            return;
+          }
+          const email = list[selectedEmail];
+          const fromDisplay = email.domain ? `${email.from}!${email.domain}` : email.from;
+          const toDisplay = email.domain ? `${email.to}!${email.domain}` : email.to;
+          document.getElementById('email-detail').innerHTML = `
+            <div class="email-detail-content">
+              <div class="email-detail-header">
+                <div><strong>From:</strong> ${fromDisplay}</div>
+                <div><strong>To:</strong> ${toDisplay}</div>
+                <div><strong>Subject:</strong> ${email.subject}</div>
               </div>
-            `;
-          }).join('');
+              <div class="email-detail-body">${email.body}</div>
+            </div>
+          `;
         }
-        document.getElementById('inboxList').innerHTML = html;
+        // Sidebar folder switching
+        document.getElementById('sidebar-inbox').onclick = function() {
+          currentFolder = 'inbox';
+          selectedEmail = null;
+          document.getElementById('sidebar-inbox').classList.add('active');
+          document.getElementById('sidebar-sent').classList.remove('active');
+          renderList();
+          renderDetail();
+        };
+        document.getElementById('sidebar-sent').onclick = function() {
+          currentFolder = 'sent';
+          selectedEmail = null;
+          document.getElementById('sidebar-inbox').classList.remove('active');
+          document.getElementById('sidebar-sent').classList.add('active');
+          renderList();
+          renderDetail();
+        };
+        renderList();
+        renderDetail();
       })
       .catch(err => {
         document.getElementById('inboxError').innerText = 'Failed to load inbox.';
@@ -174,3 +207,56 @@ if (document.getElementById('sendForm')) {
     }
   };
 }
+
+// Compose Overlay logic
+if (document.getElementById('openComposeBtn')) {
+  const overlay = document.getElementById('composeOverlay');
+  const openBtn = document.getElementById('openComposeBtn');
+  const closeBtn = document.getElementById('closeComposeBtn');
+  const form = document.getElementById('composeForm');
+  const errorP = document.getElementById('composeError');
+  openBtn.onclick = function() {
+    overlay.style.display = 'flex';
+    form.reset();
+    errorP.innerText = '';
+  };
+  closeBtn.onclick = function() {
+    overlay.style.display = 'none';
+  };
+  form.onsubmit = async function(e) {
+    e.preventDefault();
+    const { username, password } = getCredentials();
+    if (!username || !password) {
+      window.location.href = 'login.html';
+      return;
+    }
+    const toField = document.getElementById('composeTo').value.trim();
+    if (!/^\w+!.+/.test(toField)) {
+      errorP.innerText = 'Recipient must be in the format username!domain';
+      return;
+    }
+    let to = toField;
+    let domain = '';
+    if (toField.includes('!')) {
+      [to, domain] = toField.split('!');
+    }
+    const subject = document.getElementById('composeSubject').value;
+    const body = document.getElementById('composeBody').value;
+    const email = domain ? { from: username, to, domain, subject, body } : { from: username, to, subject, body };
+    const res = await fetch('http://localhost:8080/email', {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': 'Basic ' + btoa(username + ':' + password)
+      },
+      body: JSON.stringify(email)
+    });
+    if (res.ok) {
+      overlay.style.display = 'none';
+      location.reload();
+    } else {
+      const err = await res.text();
+      errorP.innerText = err;
+    }
+  };
+}
diff --git a/style.css b/style.css
index fd91b7b..ed12549 100644
--- a/style.css
+++ b/style.css
@@ -4,30 +4,168 @@ body {
   margin: 0;
   padding: 0;
 }
-.container {
+.layout {
+  display: flex;
+  min-height: 100vh;
+}
+.sidebar {
+  width: 240px;
+  background: #e0e0e0; /* Changed from #222e3c to a light grey */
+  color: #222e3c;
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  padding: 32px 0 0 0;
+  box-shadow: 2px 0 8px rgba(0,0,0,0.04);
+}
+.sidebar h2 {
+  color: #222e3c;
+  text-align: center;
+  margin-bottom: 32px;
+  font-size: 1.5em;
+  letter-spacing: 1px;
+}
+.sidebar nav ul {
+  list-style: none;
+  padding: 0;
+  margin: 0 0 24px 0;
+}
+.sidebar nav li {
+  margin: 0 0 8px 0;
+}
+.sidebar-btn {
+  width: 100%;
+  background: none;
+  border: none;
+  color: #222e3c;
+  padding: 14px 0;
+  font-size: 1.1em;
+  text-align: left;
+  padding-left: 32px;
+  cursor: pointer;
+  transition: background 0.2s;
+}
+.sidebar-btn.active, .sidebar-btn:hover {
+  background: #cccccc;
+}
+.compose-btn, .logout-btn {
+  margin: 12px 24px 0 24px;
+  padding: 12px 0;
+  border-radius: 4px;
+  border: none;
+  font-size: 1em;
+  font-weight: bold;
+  cursor: pointer;
+}
+.compose-btn {
+  background: #0077cc;
+  color: #fff;
+}
+.compose-btn:hover {
+  background: #005fa3;
+}
+.logout-btn {
   background: #fff;
-  max-width: 400px;
-  margin: 40px auto;
-  padding: 30px 40px;
-  border-radius: 8px;
-  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
+  color: #222e3c;
+  border: 1px solid #eee;
+  margin-bottom: 24px;
 }
-h1, h2 {
-  text-align: center;
+.logout-btn:hover {
+  background: #f4f4f4;
 }
-nav {
-  text-align: center;
-  margin-bottom: 20px;
+.main-content {
+  flex: 1;
+  background: #fff;
+  padding: 40px 32px;
+  display: flex;
+  gap: 32px;
 }
-nav a {
-  margin: 0 10px;
+#email-list {
+  width: 340px;
+  border-right: 1px solid #eee;
+  padding-right: 24px;
+  overflow-y: auto;
+  max-height: 70vh;
+}
+.email-list-section {
+  margin-bottom: 32px;
+}
+.email-list-title {
+  font-size: 1.1em;
   color: #0077cc;
-  text-decoration: none;
+  margin-bottom: 8px;
 }
-nav a:hover {
-  text-decoration: underline;
+.email-list-item {
+  padding: 12px 10px;
+  border-radius: 4px;
+  margin-bottom: 6px;
+  cursor: pointer;
+  border: 1px solid transparent;
+  transition: background 0.15s, border 0.15s;
 }
-input, textarea, button {
+.email-list-item.selected, .email-list-item:hover {
+  background: #f0f6fa;
+  border: 1px solid #0077cc;
+}
+.email-list-item .subject {
+  font-weight: bold;
+  color: #222e3c;
+}
+.email-list-item .fromto {
+  font-size: 0.95em;
+  color: #555;
+}
+.email-detail {
+  flex: 1;
+  min-width: 0;
+  padding-left: 24px;
+  display: flex;
+  flex-direction: column;
+  justify-content: flex-start;
+}
+.email-detail-content {
+  background: #f8fafc;
+  border-radius: 8px;
+  padding: 24px;
+  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
+}
+.email-detail-header {
+  margin-bottom: 16px;
+}
+.email-detail-header strong {
+  color: #0077cc;
+}
+.email-detail-body {
+  margin-top: 16px;
+  white-space: pre-wrap;
+  color: #222e3c;
+}
+.error {
+  color: #d8000c;
+  text-align: center;
+}
+/* Modal overlay for compose */
+.modal-overlay {
+  position: fixed;
+  top: 0; left: 0; right: 0; bottom: 0;
+  background: rgba(0,0,0,0.35);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+}
+.modal-content {
+  background: #fff;
+  padding: 32px 32px 24px 32px;
+  border-radius: 10px;
+  box-shadow: 0 4px 24px rgba(0,0,0,0.18);
+  min-width: 340px;
+  max-width: 95vw;
+  max-height: 90vh;
+  overflow-y: auto;
+  position: relative;
+}
+#composeForm input, #composeForm textarea, #composeForm button {
   width: 100%;
   margin: 8px 0;
   padding: 10px;
@@ -35,30 +173,39 @@ input, textarea, button {
   border-radius: 4px;
   box-sizing: border-box;
 }
-button {
+#composeForm button[type="submit"] {
   background: #0077cc;
   color: #fff;
   border: none;
-  cursor: pointer;
   font-weight: bold;
+  margin-bottom: 0;
 }
-button:hover {
+#composeForm button[type="submit"]:hover {
   background: #005fa3;
 }
-.error {
-  color: #d8000c;
-  text-align: center;
+#composeForm button[type="button"] {
+  background: #eee;
+  color: #222e3c;
+  border: none;
+  margin-top: 0;
 }
-#inboxList {
-  margin-top: 20px;
+#composeForm button[type="button"]:hover {
+  background: #ddd;
 }
-.email-item {
-  border-bottom: 1px solid #eee;
-  padding: 10px 0;
-}
-.email-item:last-child {
-  border-bottom: none;
-}
-.email-item strong {
-  color: #0077cc;
+@media (max-width: 900px) {
+  .main-content {
+    flex-direction: column;
+    padding: 24px 8px;
+  }
+  #email-list {
+    width: 100%;
+    max-height: 200px;
+    border-right: none;
+    border-bottom: 1px solid #eee;
+    padding-right: 0;
+    padding-bottom: 16px;
+  }
+  .email-detail {
+    padding-left: 0;
+  }
 }
