index.css

body {
    background-image: url(./images/Blackjack-bg.png);
    background-repeat: no-repeat;
    background-size: cover;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    text-align: center;
    font-weight: bold;
    font-size: 4rem;
    color: whitesmoke;
}

h1 {
    color: goldenrod;
    font-size: 8rem;
}

button {
    font-weight: bold;
    color: #016f32;
    width: 9.5rem;
    border-radius: 0.5rem;
    background-color: goldenrod;
    border: none;
    padding: 0.5rem 0.5rem;
    -webkit-border-radius: 0.5rem;
    -moz-border-radius: 0.5rem;
    -ms-border-radius: 0.5rem;
    -o-border-radius: 0.5rem;
    z-index: 1;
}

#message-el {
    font-style: italic;
}