body {
    color: white;
    background-image: url("images/universe.jpg");
    background-size: cover;
    text-align: center;
    font-family: 'Orbitron', sans-serif;
}

/*
Challenge 2:
Select the logo using its "id", and reduce its
width to a suitable level.
*/

.btn {
    padding: 6px 12px;
    background: white;
    border: none;
    font-family: 'Orbitron', sans-serif;
}

.underline {
    border-bottom: 4px solid white;
}