html {
    margin: 0;
    padding: 20px;
    color: #fff;
    font-family: Courier New;
}

body {
    background-image: url("background.png");
    background-size: cover;
    background-repeat: no-repeat;
    background-colour: #000;
}

.row {
    display: flex;
    flex-direction: row;
}

.btn {
    background: #4a4a4a;
    background-image: -webkit-linear-gradient(top, #4a4a4a, #000000);
    background-image: -moz-linear-gradient(top, #4a4a4a, #000000);
    background-image: -ms-linear-gradient(top, #4a4a4a, #000000);
    background-image: -o-linear-gradient(top, #4a4a4a, #000000);
    background-image: linear-gradient(to bottom, #4a4a4a, #000000);
    -webkit-border-radius: 5;
    -moz-border-radius: 5;
    border-radius: 5px;
    color: #d1d1d1;
    font-size: 20px;
    padding: 10px 20px 10px 20px;
    text-decoration: none;
}

.btn:hover {
    background: #787878;
    background-image: -webkit-linear-gradient(top, #787878, #383838);
    background-image: -moz-linear-gradient(top, #787878, #383838);
    background-image: -ms-linear-gradient(top, #787878, #383838);
    background-image: -o-linear-gradient(top, #787878, #383838);
    background-image: linear-gradient(to bottom, #787878, #383838);
    text-decoration: none;
}

.btn:disabled {
    color: #666;
    background: #202020;
    background-image: -webkit-linear-gradient(top, #202020, #101010);
    background-image: -moz-linear-gradient(top, #202020, #101010);
    background-image: -ms-linear-gradient(top, #202020, #101010);
    background-image: -o-linear-gradient(top, #202020, #101010);
    background-image: linear-gradient(to bottom, #202020, #101010);
    text-decoration: none;
}