header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background-color: black; /* Changed to black */
}

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

nav li {
    margin-right: 20px;
}

nav a {
    text-decoration: none;
    color: white; /* Changed to white */
}

button {
    background-color: white; /* Changed to white */
    color: black; /* Changed to black */
    padding: 10px 20px;
    border: none;
    cursor: pointer;
}