body {
    background-color: #121212;
    color: #e0e0e0;
    font-family: Arial, sans-serif;
    margin: 0;
}

header, footer {
    background: #1e1e1e;
    padding: 20px;
    text-align: center;
}

nav {
    margin: 20px 0;
}

nav a {
    color: #FFF;
    text-decoration: none;
    margin: 0 15px;
    border: 1px solid transparent;
    padding: 5px 10px;
    border-radius: 5px;
}

main {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

h1, h2 {
    color: #FFF;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    margin: 10px 0;
}

pre {
    background: #2c2c2c;
    color: #ffffff;
    padding: 2px 5px;
    border-radius: 5px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    max-width: 100%;
    margin: 0;
    display: inline;
}

section a {
    color: #e0e0e0;
    text-decoration: none;
    border: 1px solid transparent;
    padding: 5px 10px;
    border-radius: 5px;
}

ol {
    counter-reset: list-counter;
}

ol li {
    counter-increment: list-counter;
    list-style-type: none;
}

ol li::before {
    content: counter(list-counter, decimal-leading-zero) ". ";
    font-weight: bold;
}

@media (max-width: 600px) {
    nav {
        display: flex;
        justify-content: center;
        margin: 0;
    }

    nav a {
        margin: 0 10px;
        width: auto;
        text-align: center;
    }

    main {
        padding: 10px;
    }

    h1, h2 {
        font-size: 1.5em;
    }

    li {
        margin: 5px 0;
    }
}