body {
background: #333;
font: 12px Arial, Helvetica, sans-serif;
color: #FFF;
}
#canvas_holder {
margin: 0 auto;
width: 600px;
height: 400px;
background: #FFF;
}
#canvas {
}
#feedback {
}

.blink {
    animation: blink-animation 0.5s steps(5, start) infinite;
}

@keyframes blink-animation {
    to {
        visibility: hidden;
    }
}