body {
    margin: 0;
    box-sizing: border-box;
    background-color: #333;
    color: #fff;
    font-family: sans-serif;
}

h1 {
    text-align: center;
    letter-spacing: 3px;
}

a {
    color: #0a70ff;
}

li {
    line-height: 30px;
}

a:visited {
    color: #0a70ff;
}