Glitch Effect

index.html

<section id="intro-frame">
            <div id="call2action">
<div class="game-title">
    <span>Can You</span><br>
    <div class="align-box">
        <span class="emphasized glitch" data-text="hack">
            Hack
        </span>
        <span class="small">the</span><br>
    </div>
    <span class="emphasized glitch" data-text="vault?">
        Vault?
    </span>
</div>

                <button id="accept-challenge" type="button" class="button">
                    Bring it on!
                </button>
            </div>
        </section>

style.css

/* Glitch Effect */
#intro-frame .glitch {
  position: relative;
}

#intro-frame .glitch:before,
#intro-frame .glitch:after {
  background: #333;
}

#intro-frame .glitch:after {
  content: attr(data-text);
  position: absolute;
  left: 2px;
  text-shadow: -1px 0 red;
  top: 0;
  overflow: hidden;
  clip: rect(0, 900px, 0, 0);
  animation: noise-anim 2s infinite linear alternate-reverse;
}

#intro-frame .glitch:before {
  content: attr(data-text);
  position: absolute;
  left: -2px;
  text-shadow: 1px 0 blue;
  top: 0;
  overflow: hidden;
  clip: rect(0, 900px, 0, 0);
  animation: noise-anim-2 3s infinite linear alternate-reverse;
}

#intro-frame .glitch:last-child:before {
  animation: noise-anim-3 2s infinite linear alternate-reverse;
}

#intro-frame .glitch:last-child:after {
  animation: noise-anim-4 2s infinite linear alternate-reverse;
}

@keyframes noise-anim {
  0% {
    clip: rect(0,0,0,0);
  }
  54% {
    clip: rect(0,0,0,0);
  }
  55% {
    clip: rect(93px, 9999px, 93px, 0);
  }
  60% {
    clip: rect(39px, 9999px, 10px, 0);
  }
  65% {
    clip: rect(3px, 9999px, 15px, 0);
  }
  70% {
    clip: rect(59px, 9999px, 63px, 0);
  }
  75% {
    clip: rect(18px, 9999px, 96px, 0);
  }
  80% {
    clip: rect(87px, 9999px, 13px, 0);
  }
  85% {
    clip: rect(99px, 9999px, 83px, 0);
  }
  90% {
    clip: rect(20px, 9999px, 25px, 0);
  }
  95% {
    clip: rect(53px, 9999px, 3px, 0);
  }
  100% {
    clip: rect(8px, 9999px, 46px, 0);
  }
}

@keyframes noise-anim-2 {
  0% {
    clip: rect(0,0,0,0);
  }
  54% {
    clip: rect(0,0,0,0);
  }
  55% {
    clip: rect(15px, 9999px, 39px, 0);
  }
  60% {
    clip: rect(14px, 9999px, 49px, 0);
  }
  65% {
    clip: rect(79px, 9999px, 95px, 0);
  }
  70% {
    clip: rect(33px, 9999px, 62px, 0);
  }
  75% {
    clip: rect(58px, 9999px, 59px, 0);
  }
  80% {
    clip: rect(70px, 9999px, 12px, 0);
  }
  85% {
    clip: rect(98px, 9999px, 60px, 0);
  }
  90% {
    clip: rect(81px, 9999px, 91px, 0);
  }
  95% {
    clip: rect(68px, 9999px, 25px, 0);
  }
  100% {
    clip: rect(34px, 9999px, 33px, 0);
  }
}

@keyframes noise-anim-3 {
  0% {
    clip: rect(0,0,0,0);
  }
  84% {
    clip: rect(0,0,0,0);
  }
  85% {
    clip: rect(118px, 9999px, 91px, 0);
  }
  90% {
    clip: rect(53px, 9999px, 78px, 0);
  }
  95% {
    clip: rect(61px, 9999px, 113px, 0);
  }
  100% {
    clip: rect(57px, 9999px, 93px, 0);
  }
}

@keyframes noise-anim-4 {
  0% {
    clip: rect(0,0,0,0);
  }
  84% {
    clip: rect(0,0,0,0);
  }
  85% {
    clip: rect(65px, 9999px, 83px, 0);
  }
  90% {
    clip: rect(62px, 9999px, 123px, 0);
  }
  95% {
    clip: rect(69px, 9999px, 66px, 0);
  }
  100% {
    clip: rect(111px, 9999px, 92px, 0);
  }
}