body {
    background-color: black;
    color: #008b8b;
    text-shadow: 5px 0 10px darkolivegreen;
    font-family: 'Century Gothic', 'ITC Avant Garde', monospace;
    font-size: 50px; 
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

header {
    padding: 50px;
}

a { 
    text-decoration: 0;
}

a:link {
    color:#008b8b;
}

a:visited {
    color:#333366;
}

a:hover {
    color:darkolivegreen;
}

a:active {
    color:white;
}

button {
    background-color: black;
    padding: 10px 10px;
    border: 0;
}

footer { 
    padding: 50px;
}