body{
    background:black;
    color:yellow;
    text-align:center;
    font-family:Arial;
    }
    
    canvas{
    display:block;
    margin:auto;
    background:black;
    border:4px solid yellow;
    }
    
    #hud{
    font-size:20px;
    margin-top:10px;
    }
    
    button{
    margin-top:10px;
    padding:12px;
    font-size:16px;
    cursor:pointer;
    }