body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #ffffff;
    color: #333333;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background-color: #f8f8f8;
    border-bottom: 1px solid #e0e0e0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    width: 50px;
    height: 50px;
    margin-right: 10px;
}

nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    text-decoration: none;
    color: #333333;
    font-weight: bold;
}

nav ul li a.active,
nav ul li a:hover {
    color: #007BFF;
}

main {
    text-align: center;
    padding: 50px 20px;
}

.welcome h2 {
    font-size: 2em;
    margin-bottom: 10px;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #f8f8f8;
    border-top: 1px solid #e0e0e0;
    font-size: 0.9em;
    color: #666666;
}