CSS文本光线扫码特效

html,
body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    position: relative;
    font: 150%/1.5 Helvetica Neue;
    -webkit-font-smoothing: antialiased;
    background-image: url(http://www.hdwallpapers.in/walls/ios_7_galaxy-wide.jpg);
    background-size: cover;
    background-color: #19385c;
    color: #fff;
}
.shine {
    position: absolute;
    width: 400px;
    top: 50%;
    left: 50%;
    height: 60px;
    margin-left: -200px;
    font-weight: 200;
    text-align: center;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-color: #19385c;
    background-image: -webkit-linear-gradient(-45deg, rgba(0, 0, 0, 0.6) 30%, #aff0ff 50%, rgba(0, 0, 0, 0.6) 70%);
    background-blend-mode: hard-light;
    background-size: 200%;
    -webkit-animation: shine 4s infinite;
}
@-webkit-keyframes shine {
    from {
        background-position: 150%;
    }
    to {
        background-position: -50%;
    }
}
@-webkit-keyframes hover {
    from {
        transform: translateY(-50%);
    }
    to {
        transform: translateY(-75%);
    }
}
@-webkit-keyframes hoverSmall {
    from {
        transform: translateY(30%) rotate(45deg);
    }
    to {
        transform: translateY(-10%) rotate(45deg);
    }
}

HTML

<span class="shine">slide to unlock</span>