body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #222;
    color: white;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.banner {
    height: 50px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #f90;
}

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

.btn {
    background-color: #f90;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s ease;
}

.btn:hover {
    background-color: #222;
    color: #f90;
}