:root {
    color-scheme: dark;
    width: auto;
    padding: 10px 20px;
    background-color: #121212;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    color:white;
}

header {
    padding: 5px;
    border: white;
    border-radius: 25px;
    background: #252525;
    font-size: larger;
    text-align: center;
}

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

li.main_menu {
    display: inline-block;
    padding: 8px;
}

h1 {
    text-align: center;
}

h2 {
    text-decoration: underline;
} 

a {
    color: white;
}

a.main_menu {
    color: rgb(225, 225, 225);
    font-weight: bold;
}

a:hover {
    color: rgb(155, 155, 155);
}