body {
    margin: 0;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    background: #000;
    overflow: hidden;
}

button {
    width: 50%;
    padding: 1vw 1vh;
    background: #4d4d4d;
    color: #fff;
    border: none;
    border-radius: 50px;
    font-weight: bold;
}

#score {
    position: fixed;
    user-select: none;
    color: #fff;
    font-weight: bold;
    font-size: 1.2em;
    margin: 1vw 1vh;
}

#game-over-modal {
    display: flex;
    position: fixed;
    user-select: none;
    top: 25vh;
    left: 25vw;
    width: 50vw;
    height: 50vh;
    background: #fff;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#game-over-modal-score {
    margin: 0;
    font-weight: bold;
    font-size: 4em;
}