/* Simple Dark Theme with Sidebar Navigation */

/* General Reset */
body {
    background-color: #121212; /* Dark background */
    color: #ffffff; /* Light text */
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
}

/* Sidebar Navigation */
nav.sidebar {
    width: 250px;
    background: #1e1e1e; /* Dark sidebar */
    padding: 20px;
    height: 100vh; /* Full height */
    position: fixed;
    left: 0;
    top: 0;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

nav.sidebar h2 {
    color: #ffffff;
    font-size: 1.2em;
}

nav.sidebar ul {
    list-style: none;
    padding: 0;
}

nav.sidebar li {
    margin: 10px 0;
}

nav.sidebar a {
    display: block;
    padding: 10px;
    background: #333;
    color: #ffffff;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s;
}

nav.sidebar a:hover {
    background: #555;
}

/* Main Content */
main {
    margin-left: 270px; /* Make space for sidebar */
    padding: 20px;
    flex-grow: 1;
}

/* Headings */
h1, h2, h3 {
    color: #ffffff;
}

/* Links */
a {
    color: #00bcd4;
}

a:hover {
    color: #0097a7;
}
<nav class="sidebar">
    <h2>Menu</h2>
    <ul>
        <li><a href="twc_navigation.html">TWC Navigation</a></li>
        <li><a href="campaigns.html">Campaigns</a></li>
        <li><a href="https://brenthugh.com/twc/radar/" target="_blank">Radar & Live Stats</a></li>
        <li><a href="training.html">Training Server</a></li>
        <li><a href="https://discord.gg/AVsFczqxXV" target="_blank">Join Our Discord</a></li>
        <li><a href="https://www.paypal.com/donate?campaign_id=652PW9GBBUJCL" target="_blank">Donate</a></li>
        <li><a href="twc_recruitment.html">Join TWC</a></li>
        <li><a href="tobruk25_logic_for_testing.html">Testing Tobruk</a></li>
        <li><a href="twc_instructors.html">TWC_Instructors</a></li>
    </ul