html, ul, a {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
    text-decoration: none;
    list-style: none;
}

body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    justify-content: center;
    align-items: center;
}