html, body {
    margin: 0;
    padding: 0;
    background-color: #dddddd;
}

#container{
    display:inline-block;
    width:570px; 
    height:500px;
    margin: 0 auto; 
    background: black; 
    position:center; 
    border:5px solid black; 
    border-radius: 10px; 
    box-shadow: 5px 5px 50px 10px #111
}
    


.wrapper {
    width: 512px;
    margin: 0 auto;
    margin-top: 10;
    
    top: 20;
}

#instructions {
    float: left;
    font-family: sans-serif;
    color: #757575;
}

#score {
    float: right;
    color: white;
    font-size: 2em;
}

.key {
    color: #aaffdd;
}

#game-over, #game-over-overlay {
    margin: auto;
    width: 512px;
    height: 200px;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0; 
    z-index: 1;
    display: none;
}

#game-over-overlay {
    background-color: black;
    opacity: .5;
}

#game-over {
    height: 200px;
    text-align: center;
    color: white;
}

#game-over h1 {
    font-size: 3em;
    font-family: sans-serif;
}

#game-over button {
    font-size: 1.5em;
}