style.css

body{
    padding:0;
    margin:0;
    text-align:center;
    font-family: Arial, Helvetica, sans-serif;
    color: #666;
}

.center{
    margin: 0 auto;
}

.content{
    width:600px;
    text-align: left;
    height: 60%;
    padding-top: 10%;
}

.content .demostration{
    margin-top: 2em;
    font-size: 28px;
    color: #aaa;
}

.text-gray{
    color: #ccc;
}

.text-red{
    color: #a66;
}

.line{
    width: 120px;
    height: 24px;
}



@keyframes fade {
    from {
        opacity: 1.0;
    }
    50% {
        opacity: 0.4;
    }
    to {
        opacity: 1.0;
    }
}

@-webkit-keyframes fade {
    from {
        opacity: 1.0;
    }
    50% {
        opacity: 0.4;
    }
    to {
        opacity: 1.0;
    }
}

.blink{
    animation: fade 600ms infinite;
    -webkit-animation: fade 600ms infinite;
}