body {
    transition: background-color 0.3s, color 0.3s;
}

.dark-mode {
    background-color: #121212;
    color: #ffffff;
}

.custom-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 40px;
}

a {
    text-decoration: none;
    color: inherit;
}