body, html {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f0f0f0;
    color: #333;
}

.gmail-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.gmail-header {
    background-color: #e0e0e0;
    padding: 10px 20px;
    border-bottom: 1px solid #ccc;
}

.gmail-header h1 {
    margin: 0;
}

.gmail-main {
    display: flex;
    flex-grow: 1;
    overflow: hidden;
}

.gmail-sidebar {
    width: 120px;
    padding: 10px 0;
    border-right: 1px solid #ccc;
    background-color: #e8e8e8;
    text-align: center;
    color: #888;
    font-family: monospace;
    font-size: 12px;
}

.gmail-sidebar ul {
    list-style: none;
    padding: 0;
}

.gmail-sidebar li {
    margin: 10px 0;
}

.gmail-sidebar a {
    color: #333;
    text-decoration: none;
    font-size: 14px;
}

.gmail-content {
    flex-grow: 1;
    background-color: #fff;
    padding: 20px;
    overflow-y: auto;
}

.email-item {
    border-bottom: 1px solid #ddd;
    padding: 10px 5px;
    cursor: pointer;
}

.email-item:hover {
    background-color: #f5f5f5;
}

.email-item-info {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
}

.back-button {
    background: none;
    border: 1px solid #999;
    border-radius: 4px;
    padding: 5px 10px;
    margin-bottom: 10px;
    cursor: pointer;
}